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Finding the Fourth Proportional to 397.17, 548.13 and 231.45

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Solution

The fourth proportional to 397.17, 548.13 and 231.45 is: 319.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.17 : 548.13 = 231.45 : x
  2. Step 2: Convert to fraction form
    397.17/548.13 = 231.45/x
  3. Step 3: Cross multiply
    397.17x = 548.13 × 231.45
  4. Step 4: Simplify right side
    397.17x = 126,864.69
  5. Step 5: Solve for x
    x = 126,864.69/397.17
  6. Step 6: Final answer
    x = 319.42

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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.