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Finding the Third Proportional to 5,478 and 7,839

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Solution

The third proportional to 5,478 and 7,839 is: 11,217.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,478 : 7,839 = 7,839 : x
  2. Step 2: Convert to fraction form
    5,478/7,839 = 7,839/x
  3. Step 3: Cross multiply
    5,478x = 7,839 × 7,839
  4. Step 4: Simplify right side
    5,478x = 61,449,921
  5. Step 5: Solve for x
    x = 61,449,921/5,478
  6. Step 6: Final answer
    x = 11,217.58

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.