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Finding the Fourth Proportional to 99,138.92, 136,778.40 and 63,349.88

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Solution

The fourth proportional to 99,138.92, 136,778.40 and 63,349.88 is: 87,401.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,138.92 : 136,778.40 = 63,349.88 : x
  2. Step 2: Convert to fraction form
    99,138.92/136,778.40 = 63,349.88/x
  3. Step 3: Cross multiply
    99,138.92x = 136,778.40 × 63,349.88
  4. Step 4: Simplify right side
    99,138.92x = 8,664,895,226.59
  5. Step 5: Solve for x
    x = 8,664,895,226.59/99,138.92
  6. Step 6: Final answer
    x = 87,401.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.