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Finding the Fourth Proportional to 396.40, 547.05 and 230.65

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Solution

The fourth proportional to 396.40, 547.05 and 230.65 is: 318.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.40 : 547.05 = 230.65 : x
  2. Step 2: Convert to fraction form
    396.40/547.05 = 230.65/x
  3. Step 3: Cross multiply
    396.40x = 547.05 × 230.65
  4. Step 4: Simplify right side
    396.40x = 126,177.08
  5. Step 5: Solve for x
    x = 126,177.08/396.40
  6. Step 6: Final answer
    x = 318.31

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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.