Home / 61.31-87.68

Finding the Third Proportional to 61.31 and 87.68

Calculator

Solution

The third proportional to 61.31 and 87.68 is: 125.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.31 : 87.68 = 87.68 : x
  2. Step 2: Convert to fraction form
    61.31/87.68 = 87.68/x
  3. Step 3: Cross multiply
    61.31x = 87.68 × 87.68
  4. Step 4: Simplify right side
    61.31x = 7,687.73
  5. Step 5: Solve for x
    x = 7,687.73/61.31
  6. Step 6: Final answer
    x = 125.39

Related Problems

Find third proportional to 30.66 and 43.84
Half scale
Find third proportional to 122.63 and 175.36
Double scale
Find third proportional to 63 and 91
Similar ratio
Find third proportional to 91.97 and 131.52
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.