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Finding the Third Proportional to 12,904 and 21,286

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Solution

The third proportional to 12,904 and 21,286 is: 35,112.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,904 : 21,286 = 21,286 : x
  2. Step 2: Convert to fraction form
    12,904/21,286 = 21,286/x
  3. Step 3: Cross multiply
    12,904x = 21,286 × 21,286
  4. Step 4: Simplify right side
    12,904x = 453,093,796
  5. Step 5: Solve for x
    x = 453,093,796/12,904
  6. Step 6: Final answer
    x = 35,112.66

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Why These Related Problems?

These problems maintain the same ratio (1.65) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.