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Finding the Fourth Proportional to 11,387.92, 17,078.64 and 7,221.64

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Solution

The fourth proportional to 11,387.92, 17,078.64 and 7,221.64 is: 10,830.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,387.92 : 17,078.64 = 7,221.64 : x
  2. Step 2: Convert to fraction form
    11,387.92/17,078.64 = 7,221.64/x
  3. Step 3: Cross multiply
    11,387.92x = 17,078.64 × 7,221.64
  4. Step 4: Simplify right side
    11,387.92x = 123,335,789.77
  5. Step 5: Solve for x
    x = 123,335,789.77/11,387.92
  6. Step 6: Final answer
    x = 10,830.41

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