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Finding the Fourth Proportional to 138,490.56, 191,104.92 and 81,137.70

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Solution

The fourth proportional to 138,490.56, 191,104.92 and 81,137.70 is: 111,962.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,490.56 : 191,104.92 = 81,137.70 : x
  2. Step 2: Convert to fraction form
    138,490.56/191,104.92 = 81,137.70/x
  3. Step 3: Cross multiply
    138,490.56x = 191,104.92 × 81,137.70
  4. Step 4: Simplify right side
    138,490.56x = 15,505,813,667.48
  5. Step 5: Solve for x
    x = 15,505,813,667.48/138,490.56
  6. Step 6: Final answer
    x = 111,962.96

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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.