Step-by-step explanation:
Find the constant of proportionality of y to x;
y ∝ x
y = k * x; where k = constant of proportionality
When x is 29, y is 275.5
275.5 = k * 29
k = 275.5 / 29 = 9.5
Write an equation that relates y and x.
This is given as;
y = 9.5 x
Use the equation to find x when y is 408.5.
408.5 = 9.5 x
x = 408.5 / 9.5
x = 43
