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Finding the Third Proportional to 5,211 and 8,187.75

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Solution

The third proportional to 5,211 and 8,187.75 is: 12,864.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,211 : 8,187.75 = 8,187.75 : x
  2. Step 2: Convert to fraction form
    5,211/8,187.75 = 8,187.75/x
  3. Step 3: Cross multiply
    5,211x = 8,187.75 × 8,187.75
  4. Step 4: Simplify right side
    5,211x = 67,039,250.06
  5. Step 5: Solve for x
    x = 67,039,250.06/5,211
  6. Step 6: Final answer
    x = 12,864.95

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.