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Finding the Third Proportional to 4,221 and 9,078

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Solution

The third proportional to 4,221 and 9,078 is: 19,523.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,221 : 9,078 = 9,078 : x
  2. Step 2: Convert to fraction form
    4,221/9,078 = 9,078/x
  3. Step 3: Cross multiply
    4,221x = 9,078 × 9,078
  4. Step 4: Simplify right side
    4,221x = 82,410,084
  5. Step 5: Solve for x
    x = 82,410,084/4,221
  6. Step 6: Final answer
    x = 19,523.83

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.