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How Do You Solve a Proportion Using Cross Products?

Use the means extremes property of proportions to solve for 'n': 80/100=68/n

Summary

  1. 'n' is a variable
  2. Multiply the means together, 80•n
  3. Set that equal to the product of the extremes, 100•68
  4. Simplify the right hand side, 100 times 68 is 6800
  5. Divide both sides by 80 to find 'n'

Notes

    1. Multiply the 'means' together, 80•n
    2. Set that equal to the product of the extremes, 100•68
    1. 'n' is a variable
    1. The right hand side is 100•68 which is 6800
    1. On the left hand side the 80's cancel each other out leaving just 'n'
    2. And on the right, 6800 divided by 80 is 85
    1. Our answer is that 'n' equals 85