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Finding the Fourth Proportional to 138,553.92, 191,205.28 and 74,891.56

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Solution

The fourth proportional to 138,553.92, 191,205.28 and 74,891.56 is: 103,350.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,553.92 : 191,205.28 = 74,891.56 : x
  2. Step 2: Convert to fraction form
    138,553.92/191,205.28 = 74,891.56/x
  3. Step 3: Cross multiply
    138,553.92x = 191,205.28 × 74,891.56
  4. Step 4: Simplify right side
    138,553.92x = 14,319,661,699.44
  5. Step 5: Solve for x
    x = 14,319,661,699.44/138,553.92
  6. Step 6: Final answer
    x = 103,350.82

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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.