Page 394 - Basic College Mathematics with Early Integers

S E C T I O N 5.2 I PROPORTIONS 371

Objective Determine whether each proportion is a true proportion. See Examples 2 through 4.

15 5 8 20 8 9 7 4 9 2 8 3
11. = 12. = 13. = 14. = 15. = 16. =
9 3 6 15 6 7 12 7 36 8 24 9

5 625 30 600 0.8 0.2 0.7 0.3 8 5.6 4.2 5
17. = 18. = 19. = 20. = 21. = 22. =
8 1000 50 1000 0.3 0.6 0.4 0.1 10 0.7 8.4 10

3 1 2 1 2 1 5 1 4 6 6 10
2 1 5 4
4 2 5 10 5 9 8 2 5 5 7 7
23. = 24. = 25. = 26. = 27. = 28. =
4 8 2 1 2 1 5 1 6 9 3 5
1
3 9 7 3 3 4 3 5

Objectives Mixed Practice—Translating Write each sentence as a proportion.Then determine whether the
proportion is a true proportion. See Examples 1 through 4.

29. eight is to twelve as four is to six 30. six is to eight as nine is to twelve

31. five is to two as thirteen is to five 32. four is to three as seven is to five

33. one and eight tenths is to two as four and five tenths 34. fifteen hundredths is to three as thirty-five
is to five hundredths is to seven

35. two thirds is to one fifth as two fifths is to one ninth 36. ten elevenths is to three fourths as one fourth is to
one half

Objectives For each proportion, find the unknown number n. See Examples 5 through 8.
n 6 n 12 -18 3 -25 7
37. = 38. = 39. = 40. =
5 10 3 9 54 n 100 n

n 50 n 12 8 n 12 n
41. = 42. = 43. = 44. =
8 100 21 18 15 6 10 16