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Finding the Fourth Proportional to 20,633.69, 28,474.21 and 11,680.96

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Solution

The fourth proportional to 20,633.69, 28,474.21 and 11,680.96 is: 16,119.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,633.69 : 28,474.21 = 11,680.96 : x
  2. Step 2: Convert to fraction form
    20,633.69/28,474.21 = 11,680.96/x
  3. Step 3: Cross multiply
    20,633.69x = 28,474.21 × 11,680.96
  4. Step 4: Simplify right side
    20,633.69x = 332,606,007.65
  5. Step 5: Solve for x
    x = 332,606,007.65/20,633.69
  6. Step 6: Final answer
    x = 16,119.56

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