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Finding the Third Proportional to 217.88 and 478.88

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Solution

The third proportional to 217.88 and 478.88 is: 1,052.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.88 : 478.88 = 478.88 : x
  2. Step 2: Convert to fraction form
    217.88/478.88 = 478.88/x
  3. Step 3: Cross multiply
    217.88x = 478.88 × 478.88
  4. Step 4: Simplify right side
    217.88x = 229,321.27
  5. Step 5: Solve for x
    x = 229,321.27/217.88
  6. Step 6: Final answer
    x = 1,052.54

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.