Home / 87.19-131.91

Finding the Third Proportional to 87.19 and 131.91

Calculator

Solution

The third proportional to 87.19 and 131.91 is: 199.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.19 : 131.91 = 131.91 : x
  2. Step 2: Convert to fraction form
    87.19/131.91 = 131.91/x
  3. Step 3: Cross multiply
    87.19x = 131.91 × 131.91
  4. Step 4: Simplify right side
    87.19x = 17,399.26
  5. Step 5: Solve for x
    x = 17,399.26/87.19
  6. Step 6: Final answer
    x = 199.56

Related Problems

Find third proportional to 43.59 and 65.95
Half scale
Find third proportional to 174.38 and 263.81
Double scale
Find third proportional to 89 and 135
Similar ratio
Find third proportional to 130.78 and 197.86
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.