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Finding the Fourth Proportional to 387.22, 580.92 and 213.85

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Solution

The fourth proportional to 387.22, 580.92 and 213.85 is: 320.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.22 : 580.92 = 213.85 : x
  2. Step 2: Convert to fraction form
    387.22/580.92 = 213.85/x
  3. Step 3: Cross multiply
    387.22x = 580.92 × 213.85
  4. Step 4: Simplify right side
    387.22x = 124,229.09
  5. Step 5: Solve for x
    x = 124,229.09/387.22
  6. Step 6: Final answer
    x = 320.82

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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.