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Finding the Fourth Proportional to 408.72, 564.32 and 251.56

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Solution

The fourth proportional to 408.72, 564.32 and 251.56 is: 347.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.72 : 564.32 = 251.56 : x
  2. Step 2: Convert to fraction form
    408.72/564.32 = 251.56/x
  3. Step 3: Cross multiply
    408.72x = 564.32 × 251.56
  4. Step 4: Simplify right side
    408.72x = 141,961.67
  5. Step 5: Solve for x
    x = 141,961.67/408.72
  6. Step 6: Final answer
    x = 347.33

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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.