The height scale is 75
Solution:
Given that, you are trying to enlarge an image that is 4 centimeters tall and 10 centimeters wide onto a billboard that is 3 meters tall and 8 meters wide
In this problem, we have:
Height of enlarged image = 3 m
Height of original image = 4 centimeter
We have to find the height scale
Convert 4 cm to meter
Use the following conversion factor
1 cm = 0.01 m
Therefore,
4 cm = 0.04 m
Thus, we have got,
Height of original image = 0.04 m
Height of enlarged image = 3 m
Therefore, the height scale is given by the following ratio:


So, the height scale is 75