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Finding the Fourth Proportional to 392,489.12, 541,719.40 and 239,494.55

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Solution

The fourth proportional to 392,489.12, 541,719.40 and 239,494.55 is: 330,553.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,489.12 : 541,719.40 = 239,494.55 : x
  2. Step 2: Convert to fraction form
    392,489.12/541,719.40 = 239,494.55/x
  3. Step 3: Cross multiply
    392,489.12x = 541,719.40 × 239,494.55
  4. Step 4: Simplify right side
    392,489.12x = 129,738,840,621.94
  5. Step 5: Solve for x
    x = 129,738,840,621.94/392,489.12
  6. Step 6: Final answer
    x = 330,553.98

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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.