Home / 83,890.20-125,981.10-81,265.80

Finding the Fourth Proportional to 83,890.20, 125,981.10 and 81,265.80

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Solution

The fourth proportional to 83,890.20, 125,981.10 and 81,265.80 is: 122,039.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,890.20 : 125,981.10 = 81,265.80 : x
  2. Step 2: Convert to fraction form
    83,890.20/125,981.10 = 81,265.80/x
  3. Step 3: Cross multiply
    83,890.20x = 125,981.10 × 81,265.80
  4. Step 4: Simplify right side
    83,890.20x = 10,237,954,876.38
  5. Step 5: Solve for x
    x = 10,237,954,876.38/83,890.20
  6. Step 6: Final answer
    x = 122,039.94

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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.