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Finding the Fourth Proportional to 396.81, 595.22 and 315.81

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Solution

The fourth proportional to 396.81, 595.22 and 315.81 is: 473.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.81 : 595.22 = 315.81 : x
  2. Step 2: Convert to fraction form
    396.81/595.22 = 315.81/x
  3. Step 3: Cross multiply
    396.81x = 595.22 × 315.81
  4. Step 4: Simplify right side
    396.81x = 187,974.85
  5. Step 5: Solve for x
    x = 187,974.85/396.81
  6. Step 6: Final answer
    x = 473.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.