a:b = 3:4 and b:c = 2:1 => a:b:c = 3:4:2 How?

See here we have 4 values A-3 B-4 B-2 C-1 We start by making both the b equals by multiplying them hence B-8 Now the as the B paired with A was multiplied by 2 to become 8 u do the same with A.A becomes 3*2, A becomes 6 Do same with C multiply C with 4 4*1,C becomes 4 Now we have A:B:C::6:8:4 Simplify this u get 3:4:2 Hope this helps