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Finding the Fourth Proportional to 252.05, 378.61 and 213.61

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Solution

The fourth proportional to 252.05, 378.61 and 213.61 is: 320.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.05 : 378.61 = 213.61 : x
  2. Step 2: Convert to fraction form
    252.05/378.61 = 213.61/x
  3. Step 3: Cross multiply
    252.05x = 378.61 × 213.61
  4. Step 4: Simplify right side
    252.05x = 80,874.88
  5. Step 5: Solve for x
    x = 80,874.88/252.05
  6. Step 6: Final answer
    x = 320.87

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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.