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Finding the Fourth Proportional to 396.20, 591.46 and 340.76

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Solution

The fourth proportional to 396.20, 591.46 and 340.76 is: 508.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.20 : 591.46 = 340.76 : x
  2. Step 2: Convert to fraction form
    396.20/591.46 = 340.76/x
  3. Step 3: Cross multiply
    396.20x = 591.46 × 340.76
  4. Step 4: Simplify right side
    396.20x = 201,545.91
  5. Step 5: Solve for x
    x = 201,545.91/396.20
  6. Step 6: Final answer
    x = 508.70

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.