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Finding the Fourth Proportional to 138,481.92, 207,639.64 and 54,141.62

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Solution

The fourth proportional to 138,481.92, 207,639.64 and 54,141.62 is: 81,179.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,481.92 : 207,639.64 = 54,141.62 : x
  2. Step 2: Convert to fraction form
    138,481.92/207,639.64 = 54,141.62/x
  3. Step 3: Cross multiply
    138,481.92x = 207,639.64 × 54,141.62
  4. Step 4: Simplify right side
    138,481.92x = 11,241,946,485.82
  5. Step 5: Solve for x
    x = 11,241,946,485.82/138,481.92
  6. Step 6: Final answer
    x = 81,179.89

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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.