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4 : 10 = a : (a + 15)
10 .a = 4 (a + 15)
10 .a = 4a + 60
10.a - 4.a = 60
6a = 60
a = 60/10
a = 6 cm
4 : (4 + 6) = b : 10
4 : 10 = b : 10
10 .b = 4 . 10
10.b = 40
b = 40/10
b = 4 cm
(4 + 6) : (4 + 6 + c) = (a + 15) : (a + 15 + 5)
10 : (10 + c) = (6 + 15) : (6 + 15 + 5)
10 : (10 + c) = 21 : 26
21 (10 + c) = 10 . 26
210 + 21.c = 260
21.c = 260 - 210
21.c = 50
c = 50/21 cm
(6 + 15) : (6 + 15 + 5) = 10 : d
21 : 26 = 10 : d
21 . d = 26 . 10
21 . d = 260
d = 260/21 cm