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Finding the Third Proportional to 15,861.45 and 18,247.78

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Solution

The third proportional to 15,861.45 and 18,247.78 is: 20,993.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,861.45 : 18,247.78 = 18,247.78 : x
  2. Step 2: Convert to fraction form
    15,861.45/18,247.78 = 18,247.78/x
  3. Step 3: Cross multiply
    15,861.45x = 18,247.78 × 18,247.78
  4. Step 4: Simplify right side
    15,861.45x = 332,981,520.55
  5. Step 5: Solve for x
    x = 332,981,520.55/15,861.45
  6. Step 6: Final answer
    x = 20,993.14

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Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.