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Finding the Third Proportional to 669.38 and 997.88

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Solution

The third proportional to 669.38 and 997.88 is: 1,487.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.38 : 997.88 = 997.88 : x
  2. Step 2: Convert to fraction form
    669.38/997.88 = 997.88/x
  3. Step 3: Cross multiply
    669.38x = 997.88 × 997.88
  4. Step 4: Simplify right side
    669.38x = 995,754.52
  5. Step 5: Solve for x
    x = 995,754.52/669.38
  6. Step 6: Final answer
    x = 1,487.59

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.