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Finding the Third Proportional to 39,872 and 86,728

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Solution

The third proportional to 39,872 and 86,728 is: 188,647.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,872 : 86,728 = 86,728 : x
  2. Step 2: Convert to fraction form
    39,872/86,728 = 86,728/x
  3. Step 3: Cross multiply
    39,872x = 86,728 × 86,728
  4. Step 4: Simplify right side
    39,872x = 7,521,745,984
  5. Step 5: Solve for x
    x = 7,521,745,984/39,872
  6. Step 6: Final answer
    x = 188,647.32

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.