1. 3-9 Proportions Warm-up Problems Simplify. 1. 2. 3. 4. 5.

2. Chapter 3 3-9 Proportions

3. Solving Proportions Ratio – a comparison of two quantities, often expressed as a fraction. Proportion – An equation that states that two ratios are equal.

4. Example 1

5. Example 2

6. Try This a. b. c.

7. Example 3 The property tax on a house is $8 per $1000 assessed valuation. What is the tax on a house assessed at $165,000?

8. Try This d.The scale on a map says that 0.5 cm represents 25 km. On the map the measurement between two cities is 5 cm. What is the actual distance between these two cities? e.According to the scale on a road map, 3 inches represents 40 miles. If two cities measure 10 inches apart on the map, how many miles apart are they?