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Finding the Fourth Proportional to 81,425.63, 122,138.72 and 28,836.65

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Solution

The fourth proportional to 81,425.63, 122,138.72 and 28,836.65 is: 43,255.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,425.63 : 122,138.72 = 28,836.65 : x
  2. Step 2: Convert to fraction form
    81,425.63/122,138.72 = 28,836.65/x
  3. Step 3: Cross multiply
    81,425.63x = 122,138.72 × 28,836.65
  4. Step 4: Simplify right side
    81,425.63x = 3,522,071,520.09
  5. Step 5: Solve for x
    x = 3,522,071,520.09/81,425.63
  6. Step 6: Final answer
    x = 43,255.07

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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.