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Finding the Third Proportional to 539 and 638

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Solution

The third proportional to 539 and 638 is: 755.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    539 : 638 = 638 : x
  2. Step 2: Convert to fraction form
    539/638 = 638/x
  3. Step 3: Cross multiply
    539x = 638 × 638
  4. Step 4: Simplify right side
    539x = 407,044
  5. Step 5: Solve for x
    x = 407,044/539
  6. Step 6: Final answer
    x = 755.18

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.