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Finding the Third Proportional to 813 and 997

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Solution

The third proportional to 813 and 997 is: 1,222.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    813 : 997 = 997 : x
  2. Step 2: Convert to fraction form
    813/997 = 997/x
  3. Step 3: Cross multiply
    813x = 997 × 997
  4. Step 4: Simplify right side
    813x = 994,009
  5. Step 5: Solve for x
    x = 994,009/813
  6. Step 6: Final answer
    x = 1,222.64

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Why These Related Problems?

These problems maintain the same ratio (1.23) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.