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Finding the Fourth Proportional to 396.28, 546.61 and 238.81

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Solution

The fourth proportional to 396.28, 546.61 and 238.81 is: 329.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.28 : 546.61 = 238.81 : x
  2. Step 2: Convert to fraction form
    396.28/546.61 = 238.81/x
  3. Step 3: Cross multiply
    396.28x = 546.61 × 238.81
  4. Step 4: Simplify right side
    396.28x = 130,532.01
  5. Step 5: Solve for x
    x = 130,532.01/396.28
  6. Step 6: Final answer
    x = 329.39

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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.