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Finding the Third Proportional to 311.50 and 683

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Solution

The third proportional to 311.50 and 683 is: 1,497.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.50 : 683 = 683 : x
  2. Step 2: Convert to fraction form
    311.50/683 = 683/x
  3. Step 3: Cross multiply
    311.50x = 683 × 683
  4. Step 4: Simplify right side
    311.50x = 466,489
  5. Step 5: Solve for x
    x = 466,489/311.50
  6. Step 6: Final answer
    x = 1,497.56

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.