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Finding the Fourth Proportional to 397.15, 548.07 and 239.79

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Solution

The fourth proportional to 397.15, 548.07 and 239.79 is: 330.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.15 : 548.07 = 239.79 : x
  2. Step 2: Convert to fraction form
    397.15/548.07 = 239.79/x
  3. Step 3: Cross multiply
    397.15x = 548.07 × 239.79
  4. Step 4: Simplify right side
    397.15x = 131,421.71
  5. Step 5: Solve for x
    x = 131,421.71/397.15
  6. Step 6: Final answer
    x = 330.91

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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.