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Finding the Fourth Proportional to 13,481.59, 18,605.99 and 8,105.79

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Solution

The fourth proportional to 13,481.59, 18,605.99 and 8,105.79 is: 11,186.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,481.59 : 18,605.99 = 8,105.79 : x
  2. Step 2: Convert to fraction form
    13,481.59/18,605.99 = 8,105.79/x
  3. Step 3: Cross multiply
    13,481.59x = 18,605.99 × 8,105.79
  4. Step 4: Simplify right side
    13,481.59x = 150,816,247.68
  5. Step 5: Solve for x
    x = 150,816,247.68/13,481.59
  6. Step 6: Final answer
    x = 11,186.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.