1. Proportions Objectives: 1) solve equations with variables in numerators 2) Solve equations with variables in denominators

2. Terminology Ratio: comparison of two numbers by division (commonly expressed as a fraction ) – Ratios can also be expressed as a:b or a to b Proportion: equation stating two ratios are equal To solve a proportion, multiply both sides by the LCM of the denominators. This will eliminate all fractions.

3. Solve each equation. 1) 2)

4. Try these. 3)4)

5. 5)6)

6. Try these. 7) 8)

7. 9)

8. 10)

9. Try this. 11)

13. Example 4: In a shipment of 400 parts, 14 were found to be defective. How many defective parts should be expected in a shipment of 100?