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Use cross products to decide whether the ratios form a proportion.

Use cross products to decide whether the ratios form a proportion. ?. ?. =. =. 3 ? 18. 5 ? 12. ?. 54. 60. EXAMPLE 1. Checking a Proportion. 3. 12. a. 5. 18. The cross products are not equal, so the ratios do not form a proportion.

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K answer - PowerPoint PPT Presentation

Use cross products to decide whether the ratios form a proportion.