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Finding the Fourth Proportional to 397.20, 548.22 and 239.88

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Solution

The fourth proportional to 397.20, 548.22 and 239.88 is: 331.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.20 : 548.22 = 239.88 : x
  2. Step 2: Convert to fraction form
    397.20/548.22 = 239.88/x
  3. Step 3: Cross multiply
    397.20x = 548.22 × 239.88
  4. Step 4: Simplify right side
    397.20x = 131,507.01
  5. Step 5: Solve for x
    x = 131,507.01/397.20
  6. Step 6: Final answer
    x = 331.09

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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.