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B : C = 6 : 7 ( perbandingan 2 )
C : D = 7 : 9 ( perbandingan 3 )
Dalam perbandingan 1, A = 3. B = 4
Dalam perbandingan 2, B = 6. C = 7
Dalam perbandingan 3, C = 7. D = 9
Jika disamakan: A = 3/4 x B = 3/4 x 24 = 18
B = 4 x 6 = 24
C = 7 x (24 : 6)
= 7 x 4
= 28
D = 9/7 x 28 = 36
A : B : C : D = 18 : 24 : 28 : 36 = 9 : 12 : 14 : 18