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Finding the Fourth Proportional to 28,791.51, 43,168.80 and 12,147

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Solution

The fourth proportional to 28,791.51, 43,168.80 and 12,147 is: 18,212.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,791.51 : 43,168.80 = 12,147 : x
  2. Step 2: Convert to fraction form
    28,791.51/43,168.80 = 12,147/x
  3. Step 3: Cross multiply
    28,791.51x = 43,168.80 × 12,147
  4. Step 4: Simplify right side
    28,791.51x = 524,371,413.60
  5. Step 5: Solve for x
    x = 524,371,413.60/28,791.51
  6. Step 6: Final answer
    x = 18,212.71

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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.