Question

What fraction can be used to create a proportion with 4/12

Answer 1

$\frac{4}{12}$ has a common factor of 4 in the numerator and denominator we can reduce, which becomes:
$\frac{1}{3}$, so our proportion is

$\frac{4}{12}$ = $\frac{1}{3}$

Answer 2

8/24 
To have a proportion you must have a scaling factor. A scaling factor is a number which is multiplied by something. With my answer the scaling factor I used it 2. The ratio of any two corresponding lengths in two similar geometric figures is also called a scale factor.