Final answer:
To find the missing dimension using a scale factor of 1:12, set up a proportion and solve for the missing dimension.
Step-by-step explanation:
The missing dimension can be found by multiplying the given scale factor with the known dimension. In this case, the scale factor is 1:12 and we are trying to find the missing dimension. Let's say the known dimension is x. We can set up the proportion 1/12 = x/1 and solve for x.
Simplifying the proportion, we have 1/12 = x. Multiplying both sides by 12, we get x = 1 * 12 = 12. Therefore, the missing dimension is 12.