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10 February, 22:25

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

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  1. 10 February, 22:46
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    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
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