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Finding the Fourth Proportional to 87,666, 120,979.08 and 49,940.25

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Solution

The fourth proportional to 87,666, 120,979.08 and 49,940.25 is: 68,917.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,666 : 120,979.08 = 49,940.25 : x
  2. Step 2: Convert to fraction form
    87,666/120,979.08 = 49,940.25/x
  3. Step 3: Cross multiply
    87,666x = 120,979.08 × 49,940.25
  4. Step 4: Simplify right side
    87,666x = 6,041,725,499.97
  5. Step 5: Solve for x
    x = 6,041,725,499.97/87,666
  6. Step 6: Final answer
    x = 68,917.55

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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.