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Finding the Fourth Proportional to 138,411.30, 207,487.35 and 108,408.90

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Solution

The fourth proportional to 138,411.30, 207,487.35 and 108,408.90 is: 162,511.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,411.30 : 207,487.35 = 108,408.90 : x
  2. Step 2: Convert to fraction form
    138,411.30/207,487.35 = 108,408.90/x
  3. Step 3: Cross multiply
    138,411.30x = 207,487.35 × 108,408.90
  4. Step 4: Simplify right side
    138,411.30x = 22,493,475,377.42
  5. Step 5: Solve for x
    x = 22,493,475,377.42/138,411.30
  6. Step 6: Final answer
    x = 162,511.84

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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.