Calc 3

A cooling tower for a nuclear reactor is to be constructed in the shape of a hyperboloid of one sheet. The diameter at the base is 300 m and the minimum diameter, 500 m above the base, is 200 m. Find an equation describing the shape of the tower in the coordinates where the origin is at the center of the narrowest part of the tower. In particular, use coordinates where the origin is 500 m above the ground

I can not figure out how to find the third part of the equation. I have [(x^2)/100^2]+[(y^2)/100^2]+[(z^2)/?]=1

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