first i am going to convert 2 inches to feet which will give you 1/6 ft
so ratio 4:1/6
multiply both side by 6
24:1
second way is to convert 4 ft to inches which is 48inches
48:2
reduced
24:1
this answer is 24
some book answer accept 24 or 24:1 but in some case they have in fraction form 4:1/6