cross multiply and divide or cross products
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You cannot. You can only find a ratio of two or more objects. Then, it can be the ratio of their size, volume, mass, monetary value, temperature - or any other characteristic that can be measured.
Given one ratio, p/q, you will obtain an equivalent ratio if you multiply p and q by any non-zero integer.
Multiply each part of the ratio by the same number.
They are the same length, so 1:1 * * * * * In fact that is the one ratio they cannot be. A rhombus with equal diagonals is a square. The ratio of the lengths can have any other positive value.
Given a function f(x) find any anti-derivative, F(x). The set of all possible derivatives is obtained by adding a term not involving x which can take any value. So F(x) + C is a general derivative, where C can take any value.