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Finding the Third Proportional to 1,379 and 2,728

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Solution

The third proportional to 1,379 and 2,728 is: 5,396.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379 : 2,728 = 2,728 : x
  2. Step 2: Convert to fraction form
    1,379/2,728 = 2,728/x
  3. Step 3: Cross multiply
    1,379x = 2,728 × 2,728
  4. Step 4: Simplify right side
    1,379x = 7,441,984
  5. Step 5: Solve for x
    x = 7,441,984/1,379
  6. Step 6: Final answer
    x = 5,396.65

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Why These Related Problems?

These problems maintain the same ratio (1.98) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.