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Finding the Third Proportional to 641.25 and 992.81

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Solution

The third proportional to 641.25 and 992.81 is: 1,537.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.25 : 992.81 = 992.81 : x
  2. Step 2: Convert to fraction form
    641.25/992.81 = 992.81/x
  3. Step 3: Cross multiply
    641.25x = 992.81 × 992.81
  4. Step 4: Simplify right side
    641.25x = 985,676.66
  5. Step 5: Solve for x
    x = 985,676.66/641.25
  6. Step 6: Final answer
    x = 1,537.12

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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.