6.3 Practice B

Tell whether the ratios form a proportion. 1. 1 5 2 , 1 6 4 0 4 2. 4 9 8 0 , 1 8 5 3. 5 1 2 6 , 3 1 9 0 4. 7 2 0 8 , 2 8 0 5. 1 9 2 6 0 , 6 8 0 5 6. 9 6 , 1 1 5 0 6 4 7. 3 4 6 8 , 3 4 0 0 8. 1 8 1 5 5 , 1 1 6 3 1 6 Solve the proportion. 9. 1 2 4 4 2 x 1 10. 3 4 2 0 1 x 5 11. 1 9 02 1 x 2 12. 2 x 8 1 8 6 13. 8 x .4 2 8 0 14. 1 2 4 3 .6 11 x .5 15. 18 x .3 6 1 . 0 1 16. 3 4 2 0 0 1 x 4 17. 1 x 2 0 9 .4 18. 3 x .5 4 5 9 6 19. 2 0 . . 3 2 5 4 x 20. 6. 4 02 4 x 0 Find the value of x . 21. 3 4 0 8 x 15 9 22. x 51 11 1 5 5 23. x 42 4 1 8 4 4 24. 3 2 5 0 13 28 x 25. 1 5 8 0 1 3 7 x 5 26. 2 3 2 8 2 x 33 7 27. In a batch of 120 manufactured machine parts, 3 are found to be defective. At this rate, how many machine parts would be defective in a batch of 12,000? 28. A post office sells first-class stamps and postcard stamps. For the year, the post office sold 7 first-class stamps for every 2 postcard stamps sold. a. The post office sold 46,260 stamps for the year. How many of them were first-class stamps? How many were postcard stamps? b. First-class stamps sold for $.44 each. Postcard stamps sold for $.28 each. Write a ratio for the amount of money collected for first-class stamps to the amount of money collected for postcard stamps. c. Is the ratio you wrote in part (b) proportional to the ratio of first-class stamps sold to postcard stamps sold? Practice B For use with pages 292–298 Name Date 6.3 L E S S O N Copyright © Holt McDougal. All rights reserved. 302 Pre-Algebra Chapter 6 Resource Book Lesson 6.3