If a:b=1:2 and b:c=3:4 find a:b:c ?

To find the ratio a:b:c, we need to combine the given ratios.

Step 1: We have a:b = 1:2 and b:c = 3:4.

Step 2: To combine these ratios, we need to make sure that the 'b' in both ratios is the same. In this case, 'b' is 2 in the first ratio and 3 in the second ratio.

Step 3: To make 'b' the same in both ratios, we can multiply the first ratio by 3 and the second ratio by 2.

Step 4: This gives us a:b = 3:6 and b:c = 6:8.

Step 5: Now that 'b' is the same in both ratios, we can combine them to get a:b:c = 3:6:8.

So, a:b:c = 3:6:8.