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Finding the Third Proportional to 381 and 641.06

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Solution

The third proportional to 381 and 641.06 is: 1,078.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    381 : 641.06 = 641.06 : x
  2. Step 2: Convert to fraction form
    381/641.06 = 641.06/x
  3. Step 3: Cross multiply
    381x = 641.06 × 641.06
  4. Step 4: Simplify right side
    381x = 410,961.13
  5. Step 5: Solve for x
    x = 410,961.13/381
  6. Step 6: Final answer
    x = 1,078.64

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Why These Related Problems?

These problems maintain the same ratio (1.68) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.