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Finding the Third Proportional to 644.20 and 997.31

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Solution

The third proportional to 644.20 and 997.31 is: 1,543.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.20 : 997.31 = 997.31 : x
  2. Step 2: Convert to fraction form
    644.20/997.31 = 997.31/x
  3. Step 3: Cross multiply
    644.20x = 997.31 × 997.31
  4. Step 4: Simplify right side
    644.20x = 994,632.22
  5. Step 5: Solve for x
    x = 994,632.22/644.20
  6. Step 6: Final answer
    x = 1,543.97

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.