Question

Which ratios form a paportion?

A:4/9, 12/25
B:3/7, 18/42
C:5/11, 20/45
D:5/8, 15.25

Answer 1

A. 4/9 = 12/25
cross multiply
(4)(25) = (9)(12)
100 = 108.....this does not form a proportion

B. 3/7 = 18/42
cross multiply
(3)(42) = (18)(7)
126 = 126......this forms a true proportion <==

C. 5/11 = 20/45
cross multiply
(5)(45) = (11)(20)
225 = 220...this does not form a proportion

D. 5/8 = 15/25
cross multiply
(8)(15) = (5)(25)
120 = 125....this does not form a proportion