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Finding the Fourth Proportional to 396.98, 547.82 and 231.20

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Solution

The fourth proportional to 396.98, 547.82 and 231.20 is: 319.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.98 : 547.82 = 231.20 : x
  2. Step 2: Convert to fraction form
    396.98/547.82 = 231.20/x
  3. Step 3: Cross multiply
    396.98x = 547.82 × 231.20
  4. Step 4: Simplify right side
    396.98x = 126,655.98
  5. Step 5: Solve for x
    x = 126,655.98/396.98
  6. Step 6: Final answer
    x = 319.05

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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.