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Finding the Third Proportional to 172,821 and 268,218

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Solution

The third proportional to 172,821 and 268,218 is: 416,274.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,821 : 268,218 = 268,218 : x
  2. Step 2: Convert to fraction form
    172,821/268,218 = 268,218/x
  3. Step 3: Cross multiply
    172,821x = 268,218 × 268,218
  4. Step 4: Simplify right side
    172,821x = 71,940,895,524
  5. Step 5: Solve for x
    x = 71,940,895,524/172,821
  6. Step 6: Final answer
    x = 416,274.04

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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.