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Finding the Third Proportional to 251.50 and 408.88

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Solution

The third proportional to 251.50 and 408.88 is: 664.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.50 : 408.88 = 408.88 : x
  2. Step 2: Convert to fraction form
    251.50/408.88 = 408.88/x
  3. Step 3: Cross multiply
    251.50x = 408.88 × 408.88
  4. Step 4: Simplify right side
    251.50x = 167,178.77
  5. Step 5: Solve for x
    x = 167,178.77/251.50
  6. Step 6: Final answer
    x = 664.73

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Why These Related Problems?

These problems maintain the same ratio (1.63) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.