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Finding the Third Proportional to 408.38 and 635.63

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Solution

The third proportional to 408.38 and 635.63 is: 989.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.38 : 635.63 = 635.63 : x
  2. Step 2: Convert to fraction form
    408.38/635.63 = 635.63/x
  3. Step 3: Cross multiply
    408.38x = 635.63 × 635.63
  4. Step 4: Simplify right side
    408.38x = 404,019.14
  5. Step 5: Solve for x
    x = 404,019.14/408.38
  6. Step 6: Final answer
    x = 989.33

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.