If A:B=1:2,B:C=3:4,C:D=5:6 find A:B:C:D?
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A/B = 1/2
2A= B
B/C=3/4
4B=3C
4(2A)=3C
8A=3C
C=8A/3
C/D=5/6
6C=5D
6(8A/3)=5D
16A=5D
D=16A/5
A:B:C:D=A:2A:8A/3:16A/5
=1:2:8/3:16/5
Therefore A:B:C:D=15:30:40:48
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