Home / 87.81-122.81

Finding the Third Proportional to 87.81 and 122.81

Calculator

Solution

The third proportional to 87.81 and 122.81 is: 171.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.81 : 122.81 = 122.81 : x
  2. Step 2: Convert to fraction form
    87.81/122.81 = 122.81/x
  3. Step 3: Cross multiply
    87.81x = 122.81 × 122.81
  4. Step 4: Simplify right side
    87.81x = 15,082.91
  5. Step 5: Solve for x
    x = 15,082.91/87.81
  6. Step 6: Final answer
    x = 171.76

Related Problems

Find third proportional to 43.91 and 61.41
Half scale
Find third proportional to 175.63 and 245.63
Double scale
Find third proportional to 90 and 126
Similar ratio
Find third proportional to 131.72 and 184.22
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.