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Finding the Fourth Proportional to 396.36, 546.90 and 239.08

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Solution

The fourth proportional to 396.36, 546.90 and 239.08 is: 329.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.36 : 546.90 = 239.08 : x
  2. Step 2: Convert to fraction form
    396.36/546.90 = 239.08/x
  3. Step 3: Cross multiply
    396.36x = 546.90 × 239.08
  4. Step 4: Simplify right side
    396.36x = 130,752.85
  5. Step 5: Solve for x
    x = 130,752.85/396.36
  6. Step 6: Final answer
    x = 329.88

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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.