Tell weather the two rates form a proportion. 15. 7 inches in 9 hours; 42 inches in 54 hours 16. 12 players from 21 teams; 15 players from 24 teams 17. 440 calories in 4 servings; 300 calories in 3 servings 18. 120 units made in 5 days; 88 units made in 4 days 19. 66 wins in 82 games; 99 wins in 123 games 20. 68 hits in 172 at bats; 43 hits in 123 at bats

7/9 = 42/54...when 42/54 reduces, it becomes 7/9...so this is proportional because proportions are nothing but equivalent fractions.

u could also check it this way...
12/21 = 15/24
cross multiply
(21)(15) = (12)(24)
315 = 288these do not equal and are therefore, not proportionate

440/4 = 300/3
110 = 100not equal, so not proportionate

120/5 = 88/4
24 = 22not proportionate

66/82 = 99/123
0.804 = 0.804these are proportional

68/172 = 43/123
0.395 = 0.349nope, not proportional