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Finding the Fourth Proportional to 71,388.30, 107,074.35 and 18,801.90

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Solution

The fourth proportional to 71,388.30, 107,074.35 and 18,801.90 is: 28,200.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,388.30 : 107,074.35 = 18,801.90 : x
  2. Step 2: Convert to fraction form
    71,388.30/107,074.35 = 18,801.90/x
  3. Step 3: Cross multiply
    71,388.30x = 107,074.35 × 18,801.90
  4. Step 4: Simplify right side
    71,388.30x = 2,013,201,221.27
  5. Step 5: Solve for x
    x = 2,013,201,221.27/71,388.30
  6. Step 6: Final answer
    x = 28,200.72

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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.