To find the scale factor between the two similar triangles, you can divide the length of a side of the first triangle by the length of the corresponding side of the second triangle.
Let's denote the length of a side of the triangle on the right as \( a = 49 \) inches and the length of a side of the triangle on the left as \( b = 31.85 \) inches.
The scale factor (k) from the triangle on the right to the triangle on the left can be calculated as follows:
\[ k = \frac{b}{a} = \frac{31.85}{49} \]
Calculating this gives:
\[ k \approx 0.649 \]
Thus, the scale factor to go from the triangle on the right to the triangle on the left is approximately 0.649.