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Finding the Fourth Proportional to 28,891.80, 43,351.14 and 12,255.78

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Solution

The fourth proportional to 28,891.80, 43,351.14 and 12,255.78 is: 18,389.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,891.80 : 43,351.14 = 12,255.78 : x
  2. Step 2: Convert to fraction form
    28,891.80/43,351.14 = 12,255.78/x
  3. Step 3: Cross multiply
    28,891.80x = 43,351.14 × 12,255.78
  4. Step 4: Simplify right side
    28,891.80x = 531,302,034.59
  5. Step 5: Solve for x
    x = 531,302,034.59/28,891.80
  6. Step 6: Final answer
    x = 18,389.37

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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.