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Finding the Third Proportional to 81,722 and 128,415

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Solution

The third proportional to 81,722 and 128,415 is: 201,786.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,722 : 128,415 = 128,415 : x
  2. Step 2: Convert to fraction form
    81,722/128,415 = 128,415/x
  3. Step 3: Cross multiply
    81,722x = 128,415 × 128,415
  4. Step 4: Simplify right side
    81,722x = 16,490,412,225
  5. Step 5: Solve for x
    x = 16,490,412,225/81,722
  6. Step 6: Final answer
    x = 201,786.69

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.