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6/3 = 4/a
a = 3x4/6 = 2
3b)
9/13 = b/(b+4)
9(b +4) = 13b
(13-9)b = 36
b = 36/4 = 9
3c)
8/(8+c) = 6/9
6(8+c) = 8x9
6c = 72 - 48 = 24
c = 24/6 = 4
3d)
d/(d+4) = 8/12
12d = 8(d+4)
12d - 8d = 32
4d = 32
d = 32/4 = 8