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Finding the Third Proportional to 8,121 and 12,270

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Solution

The third proportional to 8,121 and 12,270 is: 18,538.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,121 : 12,270 = 12,270 : x
  2. Step 2: Convert to fraction form
    8,121/12,270 = 12,270/x
  3. Step 3: Cross multiply
    8,121x = 12,270 × 12,270
  4. Step 4: Simplify right side
    8,121x = 150,552,900
  5. Step 5: Solve for x
    x = 150,552,900/8,121
  6. Step 6: Final answer
    x = 18,538.71

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.