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Finding the Third Proportional to 397 and 839.38

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Solution

The third proportional to 397 and 839.38 is: 1,774.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    397 : 839.38 = 839.38 : x
  2. Step 2: Convert to fraction form
    397/839.38 = 839.38/x
  3. Step 3: Cross multiply
    397x = 839.38 × 839.38
  4. Step 4: Simplify right side
    397x = 704,550.39
  5. Step 5: Solve for x
    x = 704,550.39/397
  6. Step 6: Final answer
    x = 1,774.69

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.