I need help! I need to know how to do the work and what the answer is plzzz

Answer:
36 ft
Step-by-step explanation:
So the proportion of the big triangle is 48:4 or 12:1. So if the small triangle’s height is 3 feet, then 3*12 is 36 feet.
Answer: 36 ft
Step-by-step explanation:
Similar triangles means there is a constant proportion between the left legs, the base legs, and the hypotenuses.
[tex]\frac{LeftLeg(large)}{LeftLeg(small)}= \frac{BaseLeg(large)}{BaseLeg(small)}[/tex]
[tex]\frac{x}{3}= \frac{48}{4}[/tex]
Cross multiply: x(4) = 3(48)
solve for x: ÷4 ÷4
x = 3(12)
= 36