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Finding the Third Proportional to 7,840 and 12,166

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Solution

The third proportional to 7,840 and 12,166 is: 18,879.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,840 : 12,166 = 12,166 : x
  2. Step 2: Convert to fraction form
    7,840/12,166 = 12,166/x
  3. Step 3: Cross multiply
    7,840x = 12,166 × 12,166
  4. Step 4: Simplify right side
    7,840x = 148,011,556
  5. Step 5: Solve for x
    x = 148,011,556/7,840
  6. Step 6: Final answer
    x = 18,879.03

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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.