If a 4-inch length on a drawing corresponds to a 4-foot length on the actual object, the scale factor is equal to 1 : 12.
What is a conversion factor?
A conversion factor can be defined as a number that is typically used to convert (change) a number in one (1) set of units to another, either by dividing or multiplying.
Generally, an appropriate conversion factor to an equal value must be used when it is necessary to perform any mathematical conversion.
Conversion:
12 inches = 1 foot
X inches = 4 feet.
Cross-multiplying, we have:
X = 12 × 4
X = 48 inches.
For the scale factor, we have:
Scale factor = 4 : 48
Scale factor = 1 : 12.
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