True, 2:4 = 1:2, 3/6 and 1/2 form a proportion., 4:8 = 5:10, If two ratios are equal, they form a proportion., 1/5 = 5/25 is a proportion., False, 2:3 = 4:5, 1/2 and 3/5 form a proportion., 6:8 = 3:5, All pairs of ratios are proportions., 4/7 = 8/15

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