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Finding the Third Proportional to 7,638 and 12,285

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Solution

The third proportional to 7,638 and 12,285 is: 19,759.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,638 : 12,285 = 12,285 : x
  2. Step 2: Convert to fraction form
    7,638/12,285 = 12,285/x
  3. Step 3: Cross multiply
    7,638x = 12,285 × 12,285
  4. Step 4: Simplify right side
    7,638x = 150,921,225
  5. Step 5: Solve for x
    x = 150,921,225/7,638
  6. Step 6: Final answer
    x = 19,759.26

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Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.