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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CCSS.7.RP.A.2A

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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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CCSS.6.EE.B.7

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What does cross-multiplication mean?

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Cross-multiplication involves multiplying the numerator of one fraction by the denominator of the other fraction.

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CCSS.5.NF.B.5B

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CCSS.7.RP.A.3

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y = 20.

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CCSS.7.RP.A.3

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How do you check if two proportions are equivalent?

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You can check by cross-multiplying and seeing if the products are equal.

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Yes, they are equivalent.

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CCSS.3.NF.A.3A

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

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x = 18.

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CCSS.6.EE.B.7

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y = 6.

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CCSS.6.EE.B.7