7.1 Proportions with Expressions

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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 involve?

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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.4.NF.A.1

CCSS.5.NF.B.5B

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CCSS.6.EE.B.7

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CCSS.7.EE.B.4A

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CCSS.HSA.REI.A.2

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CCSS.3.NF.A.3B

CCSS.4.NF.A.1

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CCSS.7.NS.A.2A

CCSS.7.NS.A.2B

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What is the relationship between ratios in a proportion?

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The relationship is that the cross-products of the ratios are equal.

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CCSS.7.RP.A.2A