2. Splash Screen

3. Lesson 2 Contents Objective #1: Solve Proportions Example 1Identify Proportions Example 2Solve Proportions Objective #2: Use proportions to solve real-world problems Example 3Use a Proportion to Solve a Problem Example 4Convert Measurements

4. Lesson 2 Contents Practice and Apply Objective #1: Solve Proportions 9-25 odd (alt. 9, 13, 17, 21, 25,) Objective #2: Use proportions to solve real-world 33-41 odd, 45 (alt. 33, 37, 41, 45) Maintaining Your Skills 46-51

7. Example 2-1a Determine whether the pair of ratios forms a proportion. Write a proportion. Cross products Simplify. Answer: So,. Obj. #1: Solve Proportions

8. Example 2-1b Determine whether the pair of ratios forms a proportion. Write a proportion. Cross products Simplify. Answer:So,. Obj. #1: Solve Proportions

9. Example 2-2a Solve the proportion. Cross products Multiply. Divide. Answer:The solution is 21.6. Obj. #1: Solve Proportions

10. Example 2-2b Solve the proportion. Cross products Multiply. Divide. Answer:The solution is 5. Obj. #1: Solve Proportions

11. Example 2-1c Obj. #1: Solve Proportions

12. Determine whether each pair of ratios forms a proportion. a. b. Example 2-1c Answer: Obj. #1: Solve Proportions

13. Solve each proportion. a. b. Example 2-2c Answer: 4.5 Answer: 7 Obj. #1: Solve Proportions

14. Example 2-3a Architecture An architect builds a model of a building before the actual building is built. The model is 8 inches tall and the actual building will be 22 feet tall. The model is 20 inches wide. Find the width of the actual building. ExploreYou know the actual height of the building and the corresponding height of the model. You need to find the actual width of the building that corresponds with a model width of 20 inches. PlanWrite and solve a proportion using ratios that compare the actual building to the model. Let w represent the actual width of the building. Obj. #2: Solve real-world

15. Example 2-3b Solve Write a proportion. Cross products Multiply. Divide. Simplify. Obj. #2: Solve real-world

16. Example 2-3c Answer: The actual width of the building is 55 feet. Examine Check the cross products. Since and, the answer is correct. Obj. #2: Solve real-world

17. Example 2-4a Attractions The Circleville Pumpkin Show in Circleville, Ohio, boasts the world’s largest pumpkin pie. The pie weighs 350 pounds and is 5 feet in diameter. Find the diameter of the pie in centimeters if 1 foot = 30.48 centimeters. Let x represent the diameter in centimeters. customary measurement metric measurement customary measurement metric measurement Cross products Simplify. Answer: The diameter of the pie is 152.4 centimeters. Obj. #2: Solve real-world

18. Example 2-3d Obj. #2: Solve real-world

19. Example 2-3d Planes A model of a jet airplane has a length of 9 inches and a wingspan of 6 inches. Find the wingspan of the actual plane if the length is 120 feet. Answer: The wingspan of the actual plane is 80 feet. Obj. #2: Solve real-world

20. Example 2-4b School The gymnasium in a new school building measures 55 feet in length. Find the length of the gymnasium in centimeters if 1 ft = 30.48 centimeters. Answer: The length of the gymnasium is 1676.4 centimeters. Obj. #2: Solve real-world

22. End of Lesson 2