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Finding the Fourth Proportional to 138,618.90, 207,950.76 and 54,333.36

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Solution

The fourth proportional to 138,618.90, 207,950.76 and 54,333.36 is: 81,508.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,618.90 : 207,950.76 = 54,333.36 : x
  2. Step 2: Convert to fraction form
    138,618.90/207,950.76 = 54,333.36/x
  3. Step 3: Cross multiply
    138,618.90x = 207,950.76 × 54,333.36
  4. Step 4: Simplify right side
    138,618.90x = 11,298,663,505.35
  5. Step 5: Solve for x
    x = 11,298,663,505.35/138,618.90
  6. Step 6: Final answer
    x = 81,508.82

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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.