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Finding the Third Proportional to 5,215 and 7,638

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Solution

The third proportional to 5,215 and 7,638 is: 11,186.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,215 : 7,638 = 7,638 : x
  2. Step 2: Convert to fraction form
    5,215/7,638 = 7,638/x
  3. Step 3: Cross multiply
    5,215x = 7,638 × 7,638
  4. Step 4: Simplify right side
    5,215x = 58,339,044
  5. Step 5: Solve for x
    x = 58,339,044/5,215
  6. Step 6: Final answer
    x = 11,186.78

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.