1. 7-3 Solving Proportions (p. 297-300) Indicator  m4

2. 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. 297-300

3. 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.

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