To find the ratio of A: B: C: D, you can follow these steps:
Find the ratio of A to B: A: B = 1: 2
Find the ratio of B to C: B: C = 3: 2
Find the ratio of C to D: C: D = 1: 3
Multiply all the ratios together: A: B: C: D = (131): (231): (221): (223) = 3: 6: 4: 12
This gives you the ratio of A to B to C to D as 3: 6: 4: 12.