Answer is the ratio 9:14
Work Shown:
1 foot = 12 inches
3 feet = 36 inches, multiply both sides by 3
The "3 feet to 56 inches" is equivalent to "36 inches to 56 inches".
Then we can form the ratio 36:56. Divide both parts of that ratio by the GCF 4 and we get the reduced ratio 9:14