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Finding the Third Proportional to 4,778 and 9,991

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Solution

The third proportional to 4,778 and 9,991 is: 20,891.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,778 : 9,991 = 9,991 : x
  2. Step 2: Convert to fraction form
    4,778/9,991 = 9,991/x
  3. Step 3: Cross multiply
    4,778x = 9,991 × 9,991
  4. Step 4: Simplify right side
    4,778x = 99,820,081
  5. Step 5: Solve for x
    x = 99,820,081/4,778
  6. Step 6: Final answer
    x = 20,891.60

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Why These Related Problems?

These problems maintain the same ratio (2.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.