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Finding the Fourth Proportional to 408.38, 563.63 and 261.41

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Solution

The fourth proportional to 408.38, 563.63 and 261.41 is: 360.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.38 : 563.63 = 261.41 : x
  2. Step 2: Convert to fraction form
    408.38/563.63 = 261.41/x
  3. Step 3: Cross multiply
    408.38x = 563.63 × 261.41
  4. Step 4: Simplify right side
    408.38x = 147,334.39
  5. Step 5: Solve for x
    x = 147,334.39/408.38
  6. Step 6: Final answer
    x = 360.78

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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.