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Finding the Third Proportional to 408.38 and 632.81

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Solution

The third proportional to 408.38 and 632.81 is: 980.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.38 : 632.81 = 632.81 : x
  2. Step 2: Convert to fraction form
    408.38/632.81 = 632.81/x
  3. Step 3: Cross multiply
    408.38x = 632.81 × 632.81
  4. Step 4: Simplify right side
    408.38x = 400,451.66
  5. Step 5: Solve for x
    x = 400,451.66/408.38
  6. Step 6: Final answer
    x = 980.60

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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.