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Finding the Fourth Proportional to 396.53, 543.45 and 391.86

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Solution

The fourth proportional to 396.53, 543.45 and 391.86 is: 537.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.53 : 543.45 = 391.86 : x
  2. Step 2: Convert to fraction form
    396.53/543.45 = 391.86/x
  3. Step 3: Cross multiply
    396.53x = 543.45 × 391.86
  4. Step 4: Simplify right side
    396.53x = 212,956.32
  5. Step 5: Solve for x
    x = 212,956.32/396.53
  6. Step 6: Final answer
    x = 537.06

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.