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Finding the Fourth Proportional to 397.40, 548.17 and 231.50

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Solution

The fourth proportional to 397.40, 548.17 and 231.50 is: 319.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.40 : 548.17 = 231.50 : x
  2. Step 2: Convert to fraction form
    397.40/548.17 = 231.50/x
  3. Step 3: Cross multiply
    397.40x = 548.17 × 231.50
  4. Step 4: Simplify right side
    397.40x = 126,899.76
  5. Step 5: Solve for x
    x = 126,899.76/397.40
  6. Step 6: Final answer
    x = 319.33

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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.