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Finding the Third Proportional to 9,990 and 21,876.75

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Solution

The third proportional to 9,990 and 21,876.75 is: 47,907.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,990 : 21,876.75 = 21,876.75 : x
  2. Step 2: Convert to fraction form
    9,990/21,876.75 = 21,876.75/x
  3. Step 3: Cross multiply
    9,990x = 21,876.75 × 21,876.75
  4. Step 4: Simplify right side
    9,990x = 478,592,190.56
  5. Step 5: Solve for x
    x = 478,592,190.56/9,990
  6. Step 6: Final answer
    x = 47,907.13

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.