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Finding the Fourth Proportional to 397.54, 548.61 and 231.76

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Solution

The fourth proportional to 397.54, 548.61 and 231.76 is: 319.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.54 : 548.61 = 231.76 : x
  2. Step 2: Convert to fraction form
    397.54/548.61 = 231.76/x
  3. Step 3: Cross multiply
    397.54x = 548.61 × 231.76
  4. Step 4: Simplify right side
    397.54x = 127,143.32
  5. Step 5: Solve for x
    x = 127,143.32/397.54
  6. Step 6: Final answer
    x = 319.83

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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.