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Finding the Third Proportional to 25,811 and 39,891

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Solution

The third proportional to 25,811 and 39,891 is: 61,651.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,811 : 39,891 = 39,891 : x
  2. Step 2: Convert to fraction form
    25,811/39,891 = 39,891/x
  3. Step 3: Cross multiply
    25,811x = 39,891 × 39,891
  4. Step 4: Simplify right side
    25,811x = 1,591,291,881
  5. Step 5: Solve for x
    x = 1,591,291,881/25,811
  6. Step 6: Final answer
    x = 61,651.69

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.