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Finding the Fourth Proportional to 18,939.31, 28,409.04 and 5,791.66

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Solution

The fourth proportional to 18,939.31, 28,409.04 and 5,791.66 is: 8,687.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,939.31 : 28,409.04 = 5,791.66 : x
  2. Step 2: Convert to fraction form
    18,939.31/28,409.04 = 5,791.66/x
  3. Step 3: Cross multiply
    18,939.31x = 28,409.04 × 5,791.66
  4. Step 4: Simplify right side
    18,939.31x = 164,535,429.58
  5. Step 5: Solve for x
    x = 164,535,429.58/18,939.31
  6. Step 6: Final answer
    x = 8,687.51

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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.