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Finding the Third Proportional to 361 and 641

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Solution

The third proportional to 361 and 641 is: 1,138.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    361 : 641 = 641 : x
  2. Step 2: Convert to fraction form
    361/641 = 641/x
  3. Step 3: Cross multiply
    361x = 641 × 641
  4. Step 4: Simplify right side
    361x = 410,881
  5. Step 5: Solve for x
    x = 410,881/361
  6. Step 6: Final answer
    x = 1,138.17

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Why These Related Problems?

These problems maintain the same ratio (1.78) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.