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# 4.5 Solving Related Rates Problems

Meghan Dwyer

### AP Calculus AB/BCΒ βΎοΈ

279Β resources
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π₯Watch: AP Calculus AB/BC - Related Rates

## Special Example: Volume of a Cone π¦

The volume of a cone is a special related-rates case because of its two variables that are both rates, radius and height. In a cylinder, the radius is not a problem because it never changes. However, with a cone, as the height changes, the radius will too! Because of this, the VERY FIRST thing you should do when given a cone, is making a proportion between radius and height, and solve for the one that is unneeded to plug it into the volume formula before you do anything else!
Here is an example:
A conical water tank with vertex down has a radius of 8 ft at the top and is 22 ft high. If the water flows into the tank at a rate of 10 ft^3/min,Β  How fast is the depth of the water increases when the tank is 12 ft deep?
** Remember, always round to 3 decimal places!
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