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a) 4/a = 6/(6 + 3)
4/a = 6/9
6a = 9(4)
a = 36/6
a = 6

b) 8/12 = b/(b + 4)
2/3 = b/(b + 4)
3b = 2(b + 4)
3b = 2b + 8
b = 8

c) 6/9 = 8/(8 + c)
2/3 = 8/(8 + c)
2(8 + c) = 3(8)
16 + 2c = 24
2c = 8
c = 4

d) 4/12 = d/(d + 6)
1/3 = d/(d + 6)
3d = d + 6
2d = 6
d = 3

(a)

4/a = 6/(6 + 3)
a = 4 × 9/6 = 6 satuan

(b)

8/12 = b/(b + 4)
Kali silang
8b + 32 = 12b
12b - 8b = 32
4b = 32
b = 32/4 = 8 satuan

(c)

6/9 = 8/(8 + c)
Kali silang
48 + 6c = 72
6c = 72 - 48
c = 24/6 = 4 satuan

(d)

4/12 = d/(d + 6)
Kali silang
4d + 24 = 12d
12d - 4d = 24
8d = 24
d = 24/8 = 3 satuan