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Βιβλία Βιβλία 51 - 60 από 178 για In any proportion, the product of the means equals the product of the extremes..
" In any proportion, the product of the means equals the product of the extremes. "
The New Normal Written Arithmetic: Designed for Common Schools, Normal ... - Σελίδα 293
των Edward Brooks - 1877 - 421 σελίδες
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High School Algebra: Complete Course

Herbert Ellsworth Slaught, Nels Johann Lennes - 1908 - 494 σελίδες
...members of the equation bd be multiplied by bd, we have, ad = be. That is : If four numbers are in proportion, the product of the means equals the product of the extremes. 2. Show that if - = - , then - = -. bd а с Hint. Divide 1 = 1 by the members of the given equation....

Elementary Algebra

Jacob William Albert Young, Lambert Lincoln Jackson - 1908 - 438 σελίδες
...1. A proportion is an equation and therefore subject to the laws of equations. Sec. 404. 2. In any proportion the product of the means equals the product of the extremes. Sec. 405. 3. If the product of two numbers equals the product of two other numbers, the four numbers...

Elementary Algebra

Frederick Howland Somerville - 1908 - 407 σελίδες
...OF PROPORTION 371. Given a : b = с : d. Then ad = be. HMultiplying by bd, ad = be. That is : In any proportion, the product of the means equals the product of the extremes. 372. Given a:b = c:d. Then a = — , 6 = — , etc. d с From the equation ad = ftc we obtain by division...

Practical Arithmetic: Book I --, Τόμος 2

Lorenzo Dow Harvey - 1909
...is a mean proportional to the other two. In 4 : 8 : : 8 : 16, 8 is a mean proportional to 4 and 16. In every proportion, the product of the means equals the product of the extremes. This is the principle upon which the solution of problems in proportion depends. If three terms of...

First-year Mathematics for Secondary Schools

George William Myers - 1909 - 365 σελίδες
...the product of the first and fourth number is equal to the product of the second and third ? 97. In a proportion, the product of the means equals the product of the extremes. This is a convenient test of proportionality, 1. By this test tell what expressions in problem 2, §96,...

Practical Arithmetic: Book I --, Τόμος 2

Lorenzo Dow Harvey - 1909
...proportional to the other two. In 4 : 8 : : 8 : 16, 8 is a mean proportional to 4 and 16. In evert/ proportion, the product of the means equals the product of the extremes. This is the principle upon which the solution of problems in proportion depends. If three terms of...

New Graded Lessons in Arithmetic, Βιβλίο 8

Wilbur Fisk Nichols - 1910
...proportion. Multiply the extremes together. Multiply the means together. Compare the two products. Learn: In every proportion the product of the means equals the product of the extremes. 6. Either extreme equals the product of the means divided by the other extreme, as, 6 : 2=9 : x. 6x...

The Gilbert Arithmetics, Βιβλίο 2,Μέρη 1-2

Charles H. Gleason - 1910
...6, multiply the two extremes together. Multiply the two means together. What do you observe ? In a proportion the product of the means equals the product of the extremes. ORAL EXERCISES 171. Prove the following proportions, by comparing the products of extremes and means...

Intermediate and advanced

John Charles Stone, James Franklin Millis - 1910
...the above exercises, see whether the product of the means equals the product of the extremes. In any proportion the product of the means equals the product of the extremes. 3. x : 6 = 9 : 12. Find the value of x. Find the missing term: 4. x 5 = 12 : 4. 10. x : 5 = 80 : 10....

A Second Course in Elementary Algebra

Jacob William Albert Young, Lambert Lincoln Jackson - 1910 - 215 σελίδες
...formula of Exercise 27 find P, if W= 1000 Ib., R = 21 in., I = 15 in., r = 11 in., d = § in. 179. In any proportion the product of the means equals the product of the extremes. For, " = ~, and multiplying both members by bd, ad = be. bd 180. Conversely, If the product of two...




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