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Finding the Fourth Proportional to 396.71, 547.44 and 278.85

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Solution

The fourth proportional to 396.71, 547.44 and 278.85 is: 384.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.71 : 547.44 = 278.85 : x
  2. Step 2: Convert to fraction form
    396.71/547.44 = 278.85/x
  3. Step 3: Cross multiply
    396.71x = 547.44 × 278.85
  4. Step 4: Simplify right side
    396.71x = 152,653.64
  5. Step 5: Solve for x
    x = 152,653.64/396.71
  6. Step 6: Final answer
    x = 384.80

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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.