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Finding the Third Proportional to 9,720 and 20,991

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Solution

The third proportional to 9,720 and 20,991 is: 45,331.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,720 : 20,991 = 20,991 : x
  2. Step 2: Convert to fraction form
    9,720/20,991 = 20,991/x
  3. Step 3: Cross multiply
    9,720x = 20,991 × 20,991
  4. Step 4: Simplify right side
    9,720x = 440,622,081
  5. Step 5: Solve for x
    x = 440,622,081/9,720
  6. Step 6: Final answer
    x = 45,331.49

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.