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Finding the Third Proportional to 641.81 and 998.44

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Solution

The third proportional to 641.81 and 998.44 is: 1,553.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.81 : 998.44 = 998.44 : x
  2. Step 2: Convert to fraction form
    641.81/998.44 = 998.44/x
  3. Step 3: Cross multiply
    641.81x = 998.44 × 998.44
  4. Step 4: Simplify right side
    641.81x = 996,877.44
  5. Step 5: Solve for x
    x = 996,877.44/641.81
  6. Step 6: Final answer
    x = 1,553.22

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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.