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They are equivalent.
If the cross-product are equal the ratios are equal. Thus, a/b = c/d if (and only if) ad = bc
They are quantities that have the same values as for example 3/4 is the same as 6/8
The ratio of two equal quantities is 1 .
Two ratios, a:b and c:d are proportional if there is some number x such that a = cx and b = dx. Equivalently, if ad = bc (each is equal to cdx).