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Finding the Fourth Proportional to 83,310.80, 124,771.80 and 81,640.40

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Solution

The fourth proportional to 83,310.80, 124,771.80 and 81,640.40 is: 122,270.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,310.80 : 124,771.80 = 81,640.40 : x
  2. Step 2: Convert to fraction form
    83,310.80/124,771.80 = 81,640.40/x
  3. Step 3: Cross multiply
    83,310.80x = 124,771.80 × 81,640.40
  4. Step 4: Simplify right side
    83,310.80x = 10,186,419,660.72
  5. Step 5: Solve for x
    x = 10,186,419,660.72/83,310.80
  6. Step 6: Final answer
    x = 122,270.10

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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.