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Finding the Third Proportional to 311 and 682.75

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Solution

The third proportional to 311 and 682.75 is: 1,498.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    311 : 682.75 = 682.75 : x
  2. Step 2: Convert to fraction form
    311/682.75 = 682.75/x
  3. Step 3: Cross multiply
    311x = 682.75 × 682.75
  4. Step 4: Simplify right side
    311x = 466,147.56
  5. Step 5: Solve for x
    x = 466,147.56/311
  6. Step 6: Final answer
    x = 1,498.87

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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.