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Finding the Fourth Proportional to 397.20, 548.06 and 239.80

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Solution

The fourth proportional to 397.20, 548.06 and 239.80 is: 330.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.20 : 548.06 = 239.80 : x
  2. Step 2: Convert to fraction form
    397.20/548.06 = 239.80/x
  3. Step 3: Cross multiply
    397.20x = 548.06 × 239.80
  4. Step 4: Simplify right side
    397.20x = 131,424.79
  5. Step 5: Solve for x
    x = 131,424.79/397.20
  6. Step 6: Final answer
    x = 330.88

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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.