Answer:
The missing length would be 24.
First, you find the ratio of 55 to 33.
This gets you approximately 1.66666667
Multiply 36 by 1.66666667. This will get you 60.
60 - 36 = 24
The unknown value is 24.
15=-4+z/3
+4 +15 = +4 -4 +z/3
cancels the 4 on the right side
19 = z/3
3 x 19 = z/3 x 3
cancels 3 on the right side
I think the answer is z = 57
The answer is -9/8, hope this helps!