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Finding the Fourth Proportional to 397.17, 548.02 and 239.76

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Solution

The fourth proportional to 397.17, 548.02 and 239.76 is: 330.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.17 : 548.02 = 239.76 : x
  2. Step 2: Convert to fraction form
    397.17/548.02 = 239.76/x
  3. Step 3: Cross multiply
    397.17x = 548.02 × 239.76
  4. Step 4: Simplify right side
    397.17x = 131,389.94
  5. Step 5: Solve for x
    x = 131,389.94/397.17
  6. Step 6: Final answer
    x = 330.82

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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.