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Finding the Third Proportional to 12,990 and 18,999

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Solution

The third proportional to 12,990 and 18,999 is: 27,787.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,990 : 18,999 = 18,999 : x
  2. Step 2: Convert to fraction form
    12,990/18,999 = 18,999/x
  3. Step 3: Cross multiply
    12,990x = 18,999 × 18,999
  4. Step 4: Simplify right side
    12,990x = 360,962,001
  5. Step 5: Solve for x
    x = 360,962,001/12,990
  6. Step 6: Final answer
    x = 27,787.68

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.