Proportions & 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 determine if two ratios form a proportion?

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Two ratios form a proportion if their cross products are equal.

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CCSS.7.RP.A.2A

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CCSS.6.RP.A.3A

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No, they do not form a proportion.

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CCSS.7.RP.A.2A

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No, they do not form a proportion.

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CCSS.7.RP.A.2A

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x = 9.

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CCSS.7.RP.A.2C

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Yes, they form a proportion.

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CCSS.7.RP.A.2A

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a = 4.

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What is the first step in solving a proportion?

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Cross-multiply the two ratios.

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CCSS.7.RP.A.3

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What does it mean if two ratios are equivalent?

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It means they represent the same relationship or value.

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CCSS.6.RP.A.3A