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Finding the Fourth Proportional to 439,240.40, 658,471.80 and 392,001.20

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Solution

The fourth proportional to 439,240.40, 658,471.80 and 392,001.20 is: 587,654.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,240.40 : 658,471.80 = 392,001.20 : x
  2. Step 2: Convert to fraction form
    439,240.40/658,471.80 = 392,001.20/x
  3. Step 3: Cross multiply
    439,240.40x = 658,471.80 × 392,001.20
  4. Step 4: Simplify right side
    439,240.40x = 258,121,735,766.16
  5. Step 5: Solve for x
    x = 258,121,735,766.16/439,240.40
  6. Step 6: Final answer
    x = 587,654.81

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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.