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Finding the Fourth Proportional to 20,855.78, 28,773.93 and 11,896.98

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Solution

The fourth proportional to 20,855.78, 28,773.93 and 11,896.98 is: 16,413.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855.78 : 28,773.93 = 11,896.98 : x
  2. Step 2: Convert to fraction form
    20,855.78/28,773.93 = 11,896.98/x
  3. Step 3: Cross multiply
    20,855.78x = 28,773.93 × 11,896.98
  4. Step 4: Simplify right side
    20,855.78x = 342,322,806.44
  5. Step 5: Solve for x
    x = 342,322,806.44/20,855.78
  6. Step 6: Final answer
    x = 16,413.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.