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Finding the Third Proportional to 18,871.50 and 39,991.50

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Solution

The third proportional to 18,871.50 and 39,991.50 is: 84,747.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871.50 : 39,991.50 = 39,991.50 : x
  2. Step 2: Convert to fraction form
    18,871.50/39,991.50 = 39,991.50/x
  3. Step 3: Cross multiply
    18,871.50x = 39,991.50 × 39,991.50
  4. Step 4: Simplify right side
    18,871.50x = 1,599,320,072.25
  5. Step 5: Solve for x
    x = 1,599,320,072.25/18,871.50
  6. Step 6: Final answer
    x = 84,747.90

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.