7-3 Solving Proportions (p. 297-300) Indicator  m4.

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7-3 Solving Proportions (p ) Indicator  m4

A proportion is an equation stating that two ratios are equivalent. Two ratios form a proportion if their cross-products are equal (find cross-products using the candy canes.) The cross products can be used to solve for a missing number in the proportion. A proportion is an equation stating that two ratios are equivalent. Two ratios form a proportion if their cross-products are equal (find cross-products using the candy canes.) The cross products can be used to solve for a missing number in the proportion. 7-3 Solving Proportions p

You can show that two ratios are equivalent with an equation called a proportion. When two ratios form a proportion, the cross products are equal. You can solve a proportion by using cross products to find a missing term. Can you form a proportion with the ratios and ? 10 = 10 2 × 51 ×10 Set the ratios equal to each other. Cross-multiply (candy canes) Since the cross products are equal, the ratios form a proportion.

Solve. = u × 16 = u × = 16u 192 = 16u = u 12 = u Cross-multiply (candy canes) 64 × 3 (Isolate the variable) Divide each side by 16.