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Finding the Fourth Proportional to 258,628.72, 387,943.08 and 81,149.92

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Solution

The fourth proportional to 258,628.72, 387,943.08 and 81,149.92 is: 121,724.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,628.72 : 387,943.08 = 81,149.92 : x
  2. Step 2: Convert to fraction form
    258,628.72/387,943.08 = 81,149.92/x
  3. Step 3: Cross multiply
    258,628.72x = 387,943.08 × 81,149.92
  4. Step 4: Simplify right side
    258,628.72x = 31,481,549,906.55
  5. Step 5: Solve for x
    x = 31,481,549,906.55/258,628.72
  6. Step 6: Final answer
    x = 121,724.88

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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.