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To express that the ratio of A to B is equal to the ratio of C to D, we write the quantities thus : A : B : : C : D; and read, A is to B as C to D.
Manual of Geometry and Conic Sections: With Applications to Trigonometry and ... - Page 70
by William Guy Peck - 1876 - 366 pages

## An Elementary Treatise on Algebra: Designed as First Lessons in that Science

Horatio Nelson Robinson - Algebra - 1850 - 256 pages
...ways, Thus, a:b: :c:d Or thus, . . . . a : b = c : d The last is the modern method, and means that the ratio of a to b is equal to the ratio of c to d. If a is taken as the unit of measure between a and b, then - is the numerical ratio between these two...

## Elementary Geometry: With Applications in Mensuration

Charles Davies - Geometry - 1850 - 236 pages
...other, they are said to be in proportion. Hence, proportion is an equality of ratios. To express that the ratio of A to B is equal to the ratio of C to D, we write the quantities thus : A : B : : C : D; and read, A is to B, as C to D. The quantities which...

## Elementary Geometry: With Applications in Mensuration

Charles Davies - Geometry - 1850 - 218 pages
...other, they are said to be in proportion. Hemce, proportion is an equality of ratios. To express that the ratio of A to B is equal to the ratio of C to Dj we write the quantities thus : A : B : : C : D; .and read, A is to B, as C to D. The quantities...

## Elementary Algebra: Embracing the First Principles of the Science

Charles Davies - Algebra - 1850 - 292 pages
...C, and Z), having such values that BD then A is said to have the same ratio to B that C has to D or, the ratio of A to B is equal to the ratio of C 10 D When four quantities have this relation to each other, they are said to be in proportion. Hence,...

## Ray's Algebra Part Second: An Analytical Treatise, Designed for High Schools ...

Joseph Ray - Algebra - 1852 - 410 pages
...an equality of ratios. That is, when two ratios are equal, their terms are said to be proportional. Thus, if the ratio of a to b, is equal to the ratio of c to d, that is, if -=-, then a, b, c, d, form a proportion, and we say that a is to ac b as c is to d. Proportion...

## Elements of Geometry and Trigonometry: With Applications in Mensuration

Charles Davies - Geometry - 1886 - 334 pages
...proportion of four quantities results from an equality of their ratios taken two and two . To express that the ratio of A to B is equal to the ratio of C to D, we write the quantities thus : A : B :: G : D ; and read, A is to B, as C to D. The quantities which...

## Elements of Geometry and Trigonometry

Adrien Marie Legendre - Geometry - 1852 - 436 pages
...four quantities have this relation1 to each other, they are said to be in proportion. To indicate that the ratio of A to B is equal to the ratio of C to !>, the quantities are usually written thus, A : .B : : C : D, and read, A is to B as C is to D. The...

## Elements of Geometry and Trigonometry from the Works of A.M. Legendre ...

Charles Davies - Geometry - 1854 - 436 pages
...four quantities have this relation to each other, they are said to be in proportion. To indicate that the ratio of A to B is equal to the ratio of C to D, the quantities are usually written thus, A : B : : C : D, and read, A is to B as C is to D. The quantities...