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Finding the Third Proportional to 216.75 and 402.88

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Solution

The third proportional to 216.75 and 402.88 is: 748.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.75 : 402.88 = 402.88 : x
  2. Step 2: Convert to fraction form
    216.75/402.88 = 402.88/x
  3. Step 3: Cross multiply
    216.75x = 402.88 × 402.88
  4. Step 4: Simplify right side
    216.75x = 162,308.27
  5. Step 5: Solve for x
    x = 162,308.27/216.75
  6. Step 6: Final answer
    x = 748.83

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Why These Related Problems?

These problems maintain the same ratio (1.86) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.