Classroom Projector Buyer''s Guide Throw .
This means that for each foot of image width, the projector needs to be 2 feet away or D/W = 2/1 = So if I''m using a projector with a throw ratio of and I have an image width of 5 feet, then my throw distance must be 10 feet. Conversely if my distance from the screen is 20 feet then my image must be 10 feet wide. So the throw ratio is a simple formula that let''s you easily compute ...