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What are proportions

User Osos
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A proportion is an equation which states that two ratios are equal.

For example,
(a)/(b) = (c)/(d) is an example of a proportion. In the given proportion, a and d are called extremes and b and c are called means. The first property that I will talk about states that the product of the extremes equals the product of the means. This idea is called the (means-extreme property).

User Jisselle
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