Printed letters are measured in units called points, is equal to 1/72 inch. If your want the printed title of your project to be 1/4 inch tall - what point size should you use?

The problem states that 1 point is equal to $\frac{1}{72}$ inch.

You want the printed title to be $\frac{1}{4}$ inch tall.

To find out how many points are in $\frac{1}{4}$ inch, we can set up a proportion or multiply the desired height by the inverse of the conversion factor (since 1 inch = 72 points).

You should use a point size of 18.

The point size you should use is $\text{18 points}$.