title: Proportion numbers calculation. 5000 proportion of 240
body: <p>I'm trying to find the proportion of numbers. I built a circular range slider using Jcanvas.
  The angle total is 240 degree. I would like to keep a number between this value. </p>
  
  <p>Example: 5,000 proportion of 240. Basically, when I slide the handle toward the 240 mark it will equal 5,000.</p>
  
  <p>5000 will be the 240 mark, anywhere in between the number will adjust saying 120 mark will equal 2500.</p>
  
  <p>I hope I'm explaining this clearly. Trying to expand my Jquery math knowledge. </p>
  
  <p>Thanks...</p>