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Finding the Third Proportional to 1,678 and 3,992

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Solution

The third proportional to 1,678 and 3,992 is: 9,497.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678 : 3,992 = 3,992 : x
  2. Step 2: Convert to fraction form
    1,678/3,992 = 3,992/x
  3. Step 3: Cross multiply
    1,678x = 3,992 × 3,992
  4. Step 4: Simplify right side
    1,678x = 15,936,064
  5. Step 5: Solve for x
    x = 15,936,064/1,678
  6. Step 6: Final answer
    x = 9,497.06

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Why These Related Problems?

These problems maintain the same ratio (2.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.