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Finding the Fourth Proportional to 396.16, 547.64 and 392.48

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Solution

The fourth proportional to 396.16, 547.64 and 392.48 is: 542.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.16 : 547.64 = 392.48 : x
  2. Step 2: Convert to fraction form
    396.16/547.64 = 392.48/x
  3. Step 3: Cross multiply
    396.16x = 547.64 × 392.48
  4. Step 4: Simplify right side
    396.16x = 214,937.75
  5. Step 5: Solve for x
    x = 214,937.75/396.16
  6. Step 6: Final answer
    x = 542.55

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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.