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Finding the Third Proportional to 3,390 and 7,999

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Solution

The third proportional to 3,390 and 7,999 is: 18,874.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,390 : 7,999 = 7,999 : x
  2. Step 2: Convert to fraction form
    3,390/7,999 = 7,999/x
  3. Step 3: Cross multiply
    3,390x = 7,999 × 7,999
  4. Step 4: Simplify right side
    3,390x = 63,984,001
  5. Step 5: Solve for x
    x = 63,984,001/3,390
  6. Step 6: Final answer
    x = 18,874.34

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Why These Related Problems?

These problems maintain the same ratio (2.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.