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Finding the Third Proportional to 7,887 and 12,211

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Solution

The third proportional to 7,887 and 12,211 is: 18,905.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,887 : 12,211 = 12,211 : x
  2. Step 2: Convert to fraction form
    7,887/12,211 = 12,211/x
  3. Step 3: Cross multiply
    7,887x = 12,211 × 12,211
  4. Step 4: Simplify right side
    7,887x = 149,108,521
  5. Step 5: Solve for x
    x = 149,108,521/7,887
  6. Step 6: Final answer
    x = 18,905.61

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.