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Finding the Fourth Proportional to 396.89, 547.69 and 231.11

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Solution

The fourth proportional to 396.89, 547.69 and 231.11 is: 318.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.89 : 547.69 = 231.11 : x
  2. Step 2: Convert to fraction form
    396.89/547.69 = 231.11/x
  3. Step 3: Cross multiply
    396.89x = 547.69 × 231.11
  4. Step 4: Simplify right side
    396.89x = 126,577.21
  5. Step 5: Solve for x
    x = 126,577.21/396.89
  6. Step 6: Final answer
    x = 318.93

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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.