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Finding the Fourth Proportional to 71,387.70, 107,081.55 and 68,107.20

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Solution

The fourth proportional to 71,387.70, 107,081.55 and 68,107.20 is: 102,160.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,387.70 : 107,081.55 = 68,107.20 : x
  2. Step 2: Convert to fraction form
    71,387.70/107,081.55 = 68,107.20/x
  3. Step 3: Cross multiply
    71,387.70x = 107,081.55 × 68,107.20
  4. Step 4: Simplify right side
    71,387.70x = 7,293,024,542.16
  5. Step 5: Solve for x
    x = 7,293,024,542.16/71,387.70
  6. Step 6: Final answer
    x = 102,160.80

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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.