Home / 81,423-129,240

Finding the Third Proportional to 81,423 and 129,240

Calculator

Solution

The third proportional to 81,423 and 129,240 is: 205,138.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,423 : 129,240 = 129,240 : x
  2. Step 2: Convert to fraction form
    81,423/129,240 = 129,240/x
  3. Step 3: Cross multiply
    81,423x = 129,240 × 129,240
  4. Step 4: Simplify right side
    81,423x = 16,702,977,600
  5. Step 5: Solve for x
    x = 16,702,977,600/81,423
  6. Step 6: Final answer
    x = 205,138.32

Related Problems

Find third proportional to 40,711.50 and 64,620
Half scale
Find third proportional to 162,846 and 258,480
Double scale
Find third proportional to 81,425 and 129,243
Similar ratio
Find third proportional to 122,134.50 and 193,860
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.