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Finding the Third Proportional to 12,990 and 18,512

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Solution

The third proportional to 12,990 and 18,512 is: 26,381.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,990 : 18,512 = 18,512 : x
  2. Step 2: Convert to fraction form
    12,990/18,512 = 18,512/x
  3. Step 3: Cross multiply
    12,990x = 18,512 × 18,512
  4. Step 4: Simplify right side
    12,990x = 342,694,144
  5. Step 5: Solve for x
    x = 342,694,144/12,990
  6. Step 6: Final answer
    x = 26,381.38

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.