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" Four quantities are said to be Proportional, when the ratio of the first to the second, is the same as the ratio of the third to the fourth. "
A treatise on mercantile and practical arithmetic - Σελίδα 140
των John Penrose (teacher of arithmetic.) - 1824 - 300 σελίδες
Πλήρης προβολή - Σχετικά με αυτό το βιβλίο

Higher Arithmetic: Designed for the Use of High Schools, Academies, and ...

George Roberts Perkins - 1850 - 356 σελίδες
...is f . The ratio of 3i hours to 7| hours, is 3i-^7^ = i§. When there are four quantities, of which the ratio of the first to the second is the same as that of the third to the fourth, these four quantities are said to be in proportion. Thus, 4, 6, 8,...

An Elementary and Practical Arithmetic

James B. Dodd - 1850 - 276 σελίδες
...firfl of two quantities to the second, is the quotient of the first divided by the second. The inverse ratio of the first to the second, is the same as the direct ratio of the second to the first. For example, the direct ratio of 6 to 3 is §=2 ; the inverse...

An Elementary Arithmetic Designed for Academies and Schools: Also Serving as ...

George Roberts Perkins - 1851 - 356 σελίδες
...between 12 feet and 3 pounds '.' Can the ratio be a denominate number ? How are four quantities related when the ratio of the first to the second is the same as the ratio of the third to the fourth? Which are called extremes ? Which are called means 7 To what is the product...

Rudimentary Treatise on Arithmetic

John Radford Young - 1852 - 230 σελίδες
...quantities are said to be in proportion, or to form a proportion, you are merely to understand, that the ratio of the first to the second is the same as the ratio of the third to the fourth ; in other words, that if you were to divide the first by the second, you would...

High School Arithemtic: Containing the Elementary and the Higher Principles ...

James B. Dodd - 1852 - 410 σελίδες
...first of two quantities to the second, is the quotient of the first divided by the second. The inverse ratio of the first to the second, is the same as the direct ratio of the second to thejirst. For example, the direct ratio of 6 to 3 is |=2 ; the inverse...

High School Arithmetic

James B. Dodd - 1853 - 398 σελίδες
...first of two quantities to the second, is the quotient of the first divided by the second. The inverse ratio of the first to the second, is the same as the direct ratio of the second to the first. For example, the direct ratio of 6 to 3 is f—2 ; the inverse...

Rudiment: Treatise on Arithmetic, with Key, Τόμος 2

J. R. Young - 1854 - 228 σελίδες
...quantities are said to be in proportion, or to form a proportion, you are merely to understand, that the ratio of the first to the second is the same as the ratio of the third to the fourth ; in other words, that if you were to divide the first by the second, you would...

An Elementary Arithmetic Designed for Academies and Schools: Also Serving as ...

George Roberts Perkins - 1855 - 388 σελίδες
...between 12 feet and 3 pounds ? Can the ratio be a denominate number ? How are four quantities related when the ratio of the first to the second is the same as the ratio of the third to the fourth t Which are called extremes ? Which are called means ? To what is the product...

The National Arithmetic on the Inductive System: Combining the Analytic and ...

Benjamin Greenleaf - 1857 - 452 σελίδες
...2fur. 20rd. PROPORTION. 332. A PROPORTION is an equality of ratios. Any four numbers are in proportion, when the ratio of the first to the second is the same as that of the third to the fourth. Thus, the ratios 9 : 3 and 6 : 2, being equal to each other, when...

Elements of Geometry and Conic Sections

Elias Loomis - 1858 - 256 σελίδες
...must be greater than its consequent ; if equal, equal ; and if less, less. Def. 3. Three quantities are said to be proportional, when the ratio of the first to the second is equal to the ratio of the second to the third ; thus, if A, B, and C are in proportion, then A : B...




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