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Finding the Fourth Proportional to 396.65, 595.15 and 213.83

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Solution

The fourth proportional to 396.65, 595.15 and 213.83 is: 320.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.65 : 595.15 = 213.83 : x
  2. Step 2: Convert to fraction form
    396.65/595.15 = 213.83/x
  3. Step 3: Cross multiply
    396.65x = 595.15 × 213.83
  4. Step 4: Simplify right side
    396.65x = 127,260.92
  5. Step 5: Solve for x
    x = 127,260.92/396.65
  6. Step 6: Final answer
    x = 320.84

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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.