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Finding the Fourth Proportional to 19,720.92, 27,212.22 and 11,337.96

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Solution

The fourth proportional to 19,720.92, 27,212.22 and 11,337.96 is: 15,644.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,720.92 : 27,212.22 = 11,337.96 : x
  2. Step 2: Convert to fraction form
    19,720.92/27,212.22 = 11,337.96/x
  3. Step 3: Cross multiply
    19,720.92x = 27,212.22 × 11,337.96
  4. Step 4: Simplify right side
    19,720.92x = 308,531,061.87
  5. Step 5: Solve for x
    x = 308,531,061.87/19,720.92
  6. Step 6: Final answer
    x = 15,644.86

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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.