So I'm given a question that asks:

"A coffee filter is cone shaped with radius = 4 and height of 8. Suppose filter is filled with water up to a height of level h. Find an expression for the volume of water in the filter in terms of h (recall the volume of cone is $\frac{1}{3}\pi r^2 h$). Hint: look for similar figures and make a proportion"

at first glance I'm thinking I just have to rewrite the volume formula for h but the hint makes it seem like it's not that simple.