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Finding the Fourth Proportional to 82,761.80, 124,401.90 and 81,206.60

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Solution

The fourth proportional to 82,761.80, 124,401.90 and 81,206.60 is: 122,064.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,761.80 : 124,401.90 = 81,206.60 : x
  2. Step 2: Convert to fraction form
    82,761.80/124,401.90 = 81,206.60/x
  3. Step 3: Cross multiply
    82,761.80x = 124,401.90 × 81,206.60
  4. Step 4: Simplify right side
    82,761.80x = 10,102,255,332.54
  5. Step 5: Solve for x
    x = 10,102,255,332.54/82,761.80
  6. Step 6: Final answer
    x = 122,064.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.