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Finding the Third Proportional to 1,117 and 1,991

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Solution

The third proportional to 1,117 and 1,991 is: 3,548.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117 : 1,991 = 1,991 : x
  2. Step 2: Convert to fraction form
    1,117/1,991 = 1,991/x
  3. Step 3: Cross multiply
    1,117x = 1,991 × 1,991
  4. Step 4: Simplify right side
    1,117x = 3,964,081
  5. Step 5: Solve for x
    x = 3,964,081/1,117
  6. Step 6: Final answer
    x = 3,548.86

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Why These Related Problems?

These problems maintain the same ratio (1.78) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.