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Finding the Fourth Proportional to 408.27, 563.42 and 221.76

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Solution

The fourth proportional to 408.27, 563.42 and 221.76 is: 306.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.27 : 563.42 = 221.76 : x
  2. Step 2: Convert to fraction form
    408.27/563.42 = 221.76/x
  3. Step 3: Cross multiply
    408.27x = 563.42 × 221.76
  4. Step 4: Simplify right side
    408.27x = 124,945.46
  5. Step 5: Solve for x
    x = 124,945.46/408.27
  6. Step 6: Final answer
    x = 306.03

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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.