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Finding the Fourth Proportional to 394.98, 545.17 and 239.86

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Solution

The fourth proportional to 394.98, 545.17 and 239.86 is: 331.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.98 : 545.17 = 239.86 : x
  2. Step 2: Convert to fraction form
    394.98/545.17 = 239.86/x
  3. Step 3: Cross multiply
    394.98x = 545.17 × 239.86
  4. Step 4: Simplify right side
    394.98x = 130,764.48
  5. Step 5: Solve for x
    x = 130,764.48/394.98
  6. Step 6: Final answer
    x = 331.07

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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.