Home / 81,330-129,861

Finding the Third Proportional to 81,330 and 129,861

Calculator

Solution

The third proportional to 81,330 and 129,861 is: 207,351.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,330 : 129,861 = 129,861 : x
  2. Step 2: Convert to fraction form
    81,330/129,861 = 129,861/x
  3. Step 3: Cross multiply
    81,330x = 129,861 × 129,861
  4. Step 4: Simplify right side
    81,330x = 16,863,879,321
  5. Step 5: Solve for x
    x = 16,863,879,321/81,330
  6. Step 6: Final answer
    x = 207,351.28

Related Problems

Find third proportional to 40,665 and 64,930.50
Half scale
Find third proportional to 162,660 and 259,722
Double scale
Find third proportional to 81,332 and 129,864
Similar ratio
Find third proportional to 121,995 and 194,791.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.