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Finding the Fourth Proportional to 408.38, 563.57 and 221.87

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Solution

The fourth proportional to 408.38, 563.57 and 221.87 is: 306.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.38 : 563.57 = 221.87 : x
  2. Step 2: Convert to fraction form
    408.38/563.57 = 221.87/x
  3. Step 3: Cross multiply
    408.38x = 563.57 × 221.87
  4. Step 4: Simplify right side
    408.38x = 125,037.31
  5. Step 5: Solve for x
    x = 125,037.31/408.38
  6. Step 6: Final answer
    x = 306.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.