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Finding the Fourth Proportional to 71,877.20, 107,815.80 and 28,101.20

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Solution

The fourth proportional to 71,877.20, 107,815.80 and 28,101.20 is: 42,151.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,877.20 : 107,815.80 = 28,101.20 : x
  2. Step 2: Convert to fraction form
    71,877.20/107,815.80 = 28,101.20/x
  3. Step 3: Cross multiply
    71,877.20x = 107,815.80 × 28,101.20
  4. Step 4: Simplify right side
    71,877.20x = 3,029,753,358.96
  5. Step 5: Solve for x
    x = 3,029,753,358.96/71,877.20
  6. Step 6: Final answer
    x = 42,151.80

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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.