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Finding the Third Proportional to 5,170.50 and 7,991

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Solution

The third proportional to 5,170.50 and 7,991 is: 12,350.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,170.50 : 7,991 = 7,991 : x
  2. Step 2: Convert to fraction form
    5,170.50/7,991 = 7,991/x
  3. Step 3: Cross multiply
    5,170.50x = 7,991 × 7,991
  4. Step 4: Simplify right side
    5,170.50x = 63,856,081
  5. Step 5: Solve for x
    x = 63,856,081/5,170.50
  6. Step 6: Final answer
    x = 12,350.08

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.