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Finding the Fourth Proportional to 396.47, 550.90 and 392.19

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Solution

The fourth proportional to 396.47, 550.90 and 392.19 is: 544.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.47 : 550.90 = 392.19 : x
  2. Step 2: Convert to fraction form
    396.47/550.90 = 392.19/x
  3. Step 3: Cross multiply
    396.47x = 550.90 × 392.19
  4. Step 4: Simplify right side
    396.47x = 216,058.99
  5. Step 5: Solve for x
    x = 216,058.99/396.47
  6. Step 6: Final answer
    x = 544.96

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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.