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Finding the Fourth Proportional to 396.38, 547.20 and 317.42

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Solution

The fourth proportional to 396.38, 547.20 and 317.42 is: 438.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.38 : 547.20 = 317.42 : x
  2. Step 2: Convert to fraction form
    396.38/547.20 = 317.42/x
  3. Step 3: Cross multiply
    396.38x = 547.20 × 317.42
  4. Step 4: Simplify right side
    396.38x = 173,692.22
  5. Step 5: Solve for x
    x = 173,692.22/396.38
  6. Step 6: Final answer
    x = 438.20

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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.