Convert to same units, then can cancel out units:
1 ft = 12 in
→ 1 in : 4 ft = 1 in : 4 x 12 in = 1 in : 48 in = 1 : 48
So the scale factor is 48.
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6
The 1 inch to 200 miles is the smaller scale.
5.3 cubic feet.
12
1.5 feet