Solving Proportions

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What is a proportion?

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

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How do you solve a proportion?

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To solve a proportion, cross-multiply the terms and then isolate the variable.

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What is the cross-multiplication method?

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The cross-multiplication method involves multiplying the numerator of one ratio by the denominator of the other ratio.

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c = 8.

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What does scale drawing mean?

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A scale drawing is a representation of an object with accurate proportions, but at a different size.

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How do you find a missing side in similar figures?

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Set up a proportion using the corresponding sides of the similar figures and solve for the missing side.

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If two rectangles are similar and one side is 4 and the corresponding side is 20, what is the scale factor?

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The scale factor is 5 (20/4).

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What is the formula for finding a missing value in a proportion?

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