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Finding the Third Proportional to 8,211 and 12,315

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Solution

The third proportional to 8,211 and 12,315 is: 18,470.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,211 : 12,315 = 12,315 : x
  2. Step 2: Convert to fraction form
    8,211/12,315 = 12,315/x
  3. Step 3: Cross multiply
    8,211x = 12,315 × 12,315
  4. Step 4: Simplify right side
    8,211x = 151,659,225
  5. Step 5: Solve for x
    x = 151,659,225/8,211
  6. Step 6: Final answer
    x = 18,470.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.