For a screen that is 72 inches wide with a throw ratio of 2.1:1, how far should the projector be from the screen?

To determine the proper distance at which the projector should be placed from the screen, the throw ratio is key. The throw ratio of 2.1:1 means that for every 2.1 units of distance from the projector to the screen, you can project 1 unit of width.

In this case, the screen has a width of 72 inches. To find the distance, the width of the screen is multiplied by the throw ratio:

Distance = Width of Screen × Throw Ratio

Distance = 72 inches × 2.1 = 151.2 inches

This calculation indicates that the correct answer should represent a distance of 151.2 inches from the projector to the screen.

The other choices reflect distances that do not align with the calculation based on the specified throw ratio and screen width, where the distance should logically correlate with that ratio. Hence, understanding the throw ratio and applying it correctly to the specific screen width is essential for setting up the projector correctly.