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Finding the Fourth Proportional to 71,387.80, 106,979.30 and 52,520.60

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Solution

The fourth proportional to 71,387.80, 106,979.30 and 52,520.60 is: 78,705.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,387.80 : 106,979.30 = 52,520.60 : x
  2. Step 2: Convert to fraction form
    71,387.80/106,979.30 = 52,520.60/x
  3. Step 3: Cross multiply
    71,387.80x = 106,979.30 × 52,520.60
  4. Step 4: Simplify right side
    71,387.80x = 5,618,617,023.58
  5. Step 5: Solve for x
    x = 5,618,617,023.58/71,387.80
  6. Step 6: Final answer
    x = 78,705.56

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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.