If we know that tan(?) = 3/4 and ? is in Quadrant III, we can find the value of ? using the properties of trigonometric functions in that quadrant.In Quadrant III, both sine (sin) and tangent (tan) are negative. Since tan(?) = 3/4, we can determine the ratio of the opposite side to the adjacent side in a right triangle.Let's assume that the adjacent side is 4 units long and the opposite side is 3 units long. Using the Pythagorean theorem, we can find the length of the hypotenuse. Applying the equation, we have: