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Finding the Fourth Proportional to 396.30, 550.56 and 392.74

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Solution

The fourth proportional to 396.30, 550.56 and 392.74 is: 545.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.30 : 550.56 = 392.74 : x
  2. Step 2: Convert to fraction form
    396.30/550.56 = 392.74/x
  3. Step 3: Cross multiply
    396.30x = 550.56 × 392.74
  4. Step 4: Simplify right side
    396.30x = 216,226.93
  5. Step 5: Solve for x
    x = 216,226.93/396.30
  6. Step 6: Final answer
    x = 545.61

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.