Convert to the same units and simplify by dropping the units and dividing the numbers by all comon factors until the only common factor is 1.
1 ft = 12 in
→ 2 in : 4ft
= 2 in : 4 × 12 in
= 2 in : 48 in
= 2 : 48
= 1 : 24
2 in to 4 ft is the same as a scale of 1 to 24.
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1 to 16.
One-fortyeighth
It is 2" to 10 ft = 2"/120" = 1/60
.20 inches
Assuming a scale factor of 1 foot to 5 inches, 7 inches would equal 7/5 = 1.4 inches.