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Finding the Fourth Proportional to 397.29, 547.92 and 239.89

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Solution

The fourth proportional to 397.29, 547.92 and 239.89 is: 330.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.29 : 547.92 = 239.89 : x
  2. Step 2: Convert to fraction form
    397.29/547.92 = 239.89/x
  3. Step 3: Cross multiply
    397.29x = 547.92 × 239.89
  4. Step 4: Simplify right side
    397.29x = 131,438.31
  5. Step 5: Solve for x
    x = 131,438.31/397.29
  6. Step 6: Final answer
    x = 330.84

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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.