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Finding the Third Proportional to 12,857 and 27,991

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Solution

The third proportional to 12,857 and 27,991 is: 60,939.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,857 : 27,991 = 27,991 : x
  2. Step 2: Convert to fraction form
    12,857/27,991 = 27,991/x
  3. Step 3: Cross multiply
    12,857x = 27,991 × 27,991
  4. Step 4: Simplify right side
    12,857x = 783,496,081
  5. Step 5: Solve for x
    x = 783,496,081/12,857
  6. Step 6: Final answer
    x = 60,939.26

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.