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Finding the Fourth Proportional to 18,992.81, 28,469.78 and 7,905.94

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Solution

The fourth proportional to 18,992.81, 28,469.78 and 7,905.94 is: 11,850.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,992.81 : 28,469.78 = 7,905.94 : x
  2. Step 2: Convert to fraction form
    18,992.81/28,469.78 = 7,905.94/x
  3. Step 3: Cross multiply
    18,992.81x = 28,469.78 × 7,905.94
  4. Step 4: Simplify right side
    18,992.81x = 225,080,291.44
  5. Step 5: Solve for x
    x = 225,080,291.44/18,992.81
  6. Step 6: Final answer
    x = 11,850.81

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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.