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Finding the Third Proportional to 5,155 and 7,757

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Solution

The third proportional to 5,155 and 7,757 is: 11,672.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,155 : 7,757 = 7,757 : x
  2. Step 2: Convert to fraction form
    5,155/7,757 = 7,757/x
  3. Step 3: Cross multiply
    5,155x = 7,757 × 7,757
  4. Step 4: Simplify right side
    5,155x = 60,171,049
  5. Step 5: Solve for x
    x = 60,171,049/5,155
  6. Step 6: Final answer
    x = 11,672.37

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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.