Joint Proportion Theory

Joint Proportion Introduction So far we have learned about direct proportion and inverse proportion. There is a third type of proportion called joint proportion. We say a variable x is jointly proportional to a group of other variables if x is directly proportional to each of those variables as they are held constant. More simply and more commonly written, if x is jointly proportional to y and z then x = kyz for some constant k. This relationship is also written as x/yz = k. Joint proportion is nothing fancy. In fact, you have already seen joint proportion on the channel before when we were relating distance, speed and time in the handy equation d=rt (or d/rt = 1). In today’s video we go over a basic application of joint proportion. Next video we go over a harder problem involving chickens and bags of scratch which I give a glimpse of near the end. Try it out for yourself if you want! Wanna review… Direct proportion? Click here!    • Learn how to solve proportion problems lik...   Inverse proportion? Click here!    • Inverse Proportion Theory