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Finding the Fourth Proportional to 54,240.78, 81,348.04 and 20,939.61

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Solution

The fourth proportional to 54,240.78, 81,348.04 and 20,939.61 is: 31,404.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,240.78 : 81,348.04 = 20,939.61 : x
  2. Step 2: Convert to fraction form
    54,240.78/81,348.04 = 20,939.61/x
  3. Step 3: Cross multiply
    54,240.78x = 81,348.04 × 20,939.61
  4. Step 4: Simplify right side
    54,240.78x = 1,703,396,231.86
  5. Step 5: Solve for x
    x = 1,703,396,231.86/54,240.78
  6. Step 6: Final answer
    x = 31,404.35

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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.