Question

A:b=3:4,b:c=4:5,c:d=15:17then find a:b:c:d

Answer 1

HERE IS YOUR ANSWER....!!
a:b = 3:4 = 9:12 ( Multiplying by 3 )
b:c = 4:5 = 12:15 (Multiplying by 3 )
c:d = 15:17

a:b:c:d. = 9:12:15:17......

Answer 2

c:d =15:17
b:c =4:5
=12:15
a:b=3:4
=9:12
a:b:c:d = 9:12:15:17