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Finding the Fourth Proportional to 28,906.38, 39,879 and 22,914

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Solution

The fourth proportional to 28,906.38, 39,879 and 22,914 is: 31,611.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,906.38 : 39,879 = 22,914 : x
  2. Step 2: Convert to fraction form
    28,906.38/39,879 = 22,914/x
  3. Step 3: Cross multiply
    28,906.38x = 39,879 × 22,914
  4. Step 4: Simplify right side
    28,906.38x = 913,787,406
  5. Step 5: Solve for x
    x = 913,787,406/28,906.38
  6. Step 6: Final answer
    x = 31,611.96

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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.