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Finding the Third Proportional to 39,972 and 86,856

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Solution

The third proportional to 39,972 and 86,856 is: 188,731.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,972 : 86,856 = 86,856 : x
  2. Step 2: Convert to fraction form
    39,972/86,856 = 86,856/x
  3. Step 3: Cross multiply
    39,972x = 86,856 × 86,856
  4. Step 4: Simplify right side
    39,972x = 7,543,964,736
  5. Step 5: Solve for x
    x = 7,543,964,736/39,972
  6. Step 6: Final answer
    x = 188,731.23

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.