Question

If the scale factor is 1/4 square inches = 5 ft. And the cost to build the house was $46,950, what would the cost be with the scale factor?

Answer 1

1/4 square inches = 5 ft <---- makes little sense
or
1/4 square inches = 5 square ft ??

is this a continuation of your previous "scale factor" question?
if so, the scale was 1 : 24√5

then
model : 46950 = 1 : 24√5
model = 874.86

I sure some author did not embarrass him/herself by having such a question in a textbook.
This question makes no sense,
e.g. is the model built from the same material as the house, does it have plumbing, does it have electrical wiring ??? etc.