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Finding the Third Proportional to 4,787 and 8,422

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Solution

The third proportional to 4,787 and 8,422 is: 14,817.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,787 : 8,422 = 8,422 : x
  2. Step 2: Convert to fraction form
    4,787/8,422 = 8,422/x
  3. Step 3: Cross multiply
    4,787x = 8,422 × 8,422
  4. Step 4: Simplify right side
    4,787x = 70,930,084
  5. Step 5: Solve for x
    x = 70,930,084/4,787
  6. Step 6: Final answer
    x = 14,817.23

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Why These Related Problems?

These problems maintain the same ratio (1.76) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.