1. Diketahui = a : b = 1 : 2 b : c = 3 : 4 c : d = 5 : 6 Ditanya. = A. b : d B. a : d

A. b : d = 5 : 8
B. a : d = 5 : 16

A. b : d = ...
a/ b = 1/2. b = 2a. a = 1/2 b

b/ c = 3/4. 4b = 3c. b = 3/4 c

c/d = 5/6. 5d = 6c. d = 6/5 c

maka ;

b : d = 3/4 c : 6/5 c = 3/4 x 5/6 = 15/24
b : d = 5 : 6

B. a : d = 1/2 b : 6/5 c = (1/2 x 3/4 c) : 6/5 c
= 3/8 c : 6/5 c = 3/8 x 5/6
= 15/48 = 5/16
a : d = 5 : 16