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Finding the Fourth Proportional to 18,891.44, 28,340.54 and 7,791.96

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Solution

The fourth proportional to 18,891.44, 28,340.54 and 7,791.96 is: 11,689.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,891.44 : 28,340.54 = 7,791.96 : x
  2. Step 2: Convert to fraction form
    18,891.44/28,340.54 = 7,791.96/x
  3. Step 3: Cross multiply
    18,891.44x = 28,340.54 × 7,791.96
  4. Step 4: Simplify right side
    18,891.44x = 220,828,354.06
  5. Step 5: Solve for x
    x = 220,828,354.06/18,891.44
  6. Step 6: Final answer
    x = 11,689.33

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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.