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Finding the Third Proportional to 965.50 and 1,991

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Solution

The third proportional to 965.50 and 1,991 is: 4,105.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.50 : 1,991 = 1,991 : x
  2. Step 2: Convert to fraction form
    965.50/1,991 = 1,991/x
  3. Step 3: Cross multiply
    965.50x = 1,991 × 1,991
  4. Step 4: Simplify right side
    965.50x = 3,964,081
  5. Step 5: Solve for x
    x = 3,964,081/965.50
  6. Step 6: Final answer
    x = 4,105.73

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Why These Related Problems?

These problems maintain the same ratio (2.06) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.