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Finding the Fourth Proportional to 18,939.60, 28,409.40 and 5,791.97

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Solution

The fourth proportional to 18,939.60, 28,409.40 and 5,791.97 is: 8,687.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,939.60 : 28,409.40 = 5,791.97 : x
  2. Step 2: Convert to fraction form
    18,939.60/28,409.40 = 5,791.97/x
  3. Step 3: Cross multiply
    18,939.60x = 28,409.40 × 5,791.97
  4. Step 4: Simplify right side
    18,939.60x = 164,546,392.52
  5. Step 5: Solve for x
    x = 164,546,392.52/18,939.60
  6. Step 6: Final answer
    x = 8,687.96

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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.