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

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

B. 3/7 = 18/42
    cross multiply
    (3)(42) = (18)(7)
    126 = 126this 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 = 125this does not form a proportion

Bbghjkskxnxnixidnd dbshusjsjsns sndnbs