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Finding the Third Proportional to 19,728 and 39,888

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Solution

The third proportional to 19,728 and 39,888 is: 80,649.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,728 : 39,888 = 39,888 : x
  2. Step 2: Convert to fraction form
    19,728/39,888 = 39,888/x
  3. Step 3: Cross multiply
    19,728x = 39,888 × 39,888
  4. Step 4: Simplify right side
    19,728x = 1,591,052,544
  5. Step 5: Solve for x
    x = 1,591,052,544/19,728
  6. Step 6: Final answer
    x = 80,649.46

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Why These Related Problems?

These problems maintain the same ratio (2.02) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.