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Finding the Fourth Proportional to 396.68, 547.40 and 249.28

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Solution

The fourth proportional to 396.68, 547.40 and 249.28 is: 343.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.68 : 547.40 = 249.28 : x
  2. Step 2: Convert to fraction form
    396.68/547.40 = 249.28/x
  3. Step 3: Cross multiply
    396.68x = 547.40 × 249.28
  4. Step 4: Simplify right side
    396.68x = 136,455.87
  5. Step 5: Solve for x
    x = 136,455.87/396.68
  6. Step 6: Final answer
    x = 343.99

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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.