Answer:
3/4 in
Step-by-step explanation:
1/4 : 6
? : 18
Divide 18ft by 6ft, to get 3. This is by how much the original ratio will be enlarged (multiplied) to find the corresponding length for 18ft.
1/4 : 6
1/4 (3) : 6 (3)
3/4 in : 18 ft
or 3/4 in to 18 ft