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a porpotion is an equation stating thattwo ratios are equilvalent? true or false
Cross-multiply them in pairs. The ratios are the same if and only if the answers are the same. Thus a/b = c/d iff a*d = b*c.
Two ratios that are equivalent are said to be in proportion
When the cross-products of the two ratios are equal.
When they are equivalent ratios.