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Finding the Fourth Proportional to 397.60, 548.70 and 231.78

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Solution

The fourth proportional to 397.60, 548.70 and 231.78 is: 319.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.60 : 548.70 = 231.78 : x
  2. Step 2: Convert to fraction form
    397.60/548.70 = 231.78/x
  3. Step 3: Cross multiply
    397.60x = 548.70 × 231.78
  4. Step 4: Simplify right side
    397.60x = 127,177.69
  5. Step 5: Solve for x
    x = 127,177.69/397.60
  6. Step 6: Final answer
    x = 319.87

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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.