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Finding the Fourth Proportional to 18,661.62, 27,986.76 and 8,790.96

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Solution

The fourth proportional to 18,661.62, 27,986.76 and 8,790.96 is: 13,183.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,661.62 : 27,986.76 = 8,790.96 : x
  2. Step 2: Convert to fraction form
    18,661.62/27,986.76 = 8,790.96/x
  3. Step 3: Cross multiply
    18,661.62x = 27,986.76 × 8,790.96
  4. Step 4: Simplify right side
    18,661.62x = 246,030,487.69
  5. Step 5: Solve for x
    x = 246,030,487.69/18,661.62
  6. Step 6: Final answer
    x = 13,183.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.