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Finding the Third Proportional to 12,726 and 13,878

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Solution

The third proportional to 12,726 and 13,878 is: 15,134.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,726 : 13,878 = 13,878 : x
  2. Step 2: Convert to fraction form
    12,726/13,878 = 13,878/x
  3. Step 3: Cross multiply
    12,726x = 13,878 × 13,878
  4. Step 4: Simplify right side
    12,726x = 192,598,884
  5. Step 5: Solve for x
    x = 192,598,884/12,726
  6. Step 6: Final answer
    x = 15,134.28

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.