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Finding the Fourth Proportional to 396.50, 546.89 and 239.05

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Solution

The fourth proportional to 396.50, 546.89 and 239.05 is: 329.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.50 : 546.89 = 239.05 : x
  2. Step 2: Convert to fraction form
    396.50/546.89 = 239.05/x
  3. Step 3: Cross multiply
    396.50x = 546.89 × 239.05
  4. Step 4: Simplify right side
    396.50x = 130,733.54
  5. Step 5: Solve for x
    x = 130,733.54/396.50
  6. Step 6: Final answer
    x = 329.72

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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.