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If a:b = 2:3 and b:c = 4:3, then find a:b:c
a : b = 2 : 3
b : c = 4 : 3
= (4 × 3/4 : 3 × 3/4)
=3 : 9/4
a : b : c = 2 : 3: 9/4
= 8 : 12 : 9
Find the fourth proportion to 2,3,6
2:3 :: 6:x
=> 2/3 = 6/x
=> x = 18/2
=> x = 9
If A:B:C = 2:3:4, then find
Let A = 2x, B = 3x, C = 4x, then,
If A:B = 2:3, B:C = 4:5 and C:D = 6:7, then find the value of A:B:C:D
If 2 : 9 :: x : 18, then find the value of x
Treat 2:9 as 2/9 and x:18 as x/18, treat :: as =
So we get 2/9 = x/18
=> 9x = 36
=> x = 4
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