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Finding the Third Proportional to 7,891 and 12,315

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Solution

The third proportional to 7,891 and 12,315 is: 19,219.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,891 : 12,315 = 12,315 : x
  2. Step 2: Convert to fraction form
    7,891/12,315 = 12,315/x
  3. Step 3: Cross multiply
    7,891x = 12,315 × 12,315
  4. Step 4: Simplify right side
    7,891x = 151,659,225
  5. Step 5: Solve for x
    x = 151,659,225/7,891
  6. Step 6: Final answer
    x = 19,219.27

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.