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Finding the Third Proportional to 77,986 and 171,860

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Solution

The third proportional to 77,986 and 171,860 is: 378,732.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,986 : 171,860 = 171,860 : x
  2. Step 2: Convert to fraction form
    77,986/171,860 = 171,860/x
  3. Step 3: Cross multiply
    77,986x = 171,860 × 171,860
  4. Step 4: Simplify right side
    77,986x = 29,535,859,600
  5. Step 5: Solve for x
    x = 29,535,859,600/77,986
  6. Step 6: Final answer
    x = 378,732.84

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.