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Finding the Third Proportional to 10,390 and 13,999

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Solution

The third proportional to 10,390 and 13,999 is: 18,861.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,390 : 13,999 = 13,999 : x
  2. Step 2: Convert to fraction form
    10,390/13,999 = 13,999/x
  3. Step 3: Cross multiply
    10,390x = 13,999 × 13,999
  4. Step 4: Simplify right side
    10,390x = 195,972,001
  5. Step 5: Solve for x
    x = 195,972,001/10,390
  6. Step 6: Final answer
    x = 18,861.60

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.