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Finding the Fourth Proportional to 128,921.22, 193,194.90 and 91,554.48

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Solution

The fourth proportional to 128,921.22, 193,194.90 and 91,554.48 is: 137,198.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,921.22 : 193,194.90 = 91,554.48 : x
  2. Step 2: Convert to fraction form
    128,921.22/193,194.90 = 91,554.48/x
  3. Step 3: Cross multiply
    128,921.22x = 193,194.90 × 91,554.48
  4. Step 4: Simplify right side
    128,921.22x = 17,687,858,608.15
  5. Step 5: Solve for x
    x = 17,687,858,608.15/128,921.22
  6. Step 6: Final answer
    x = 137,198.97

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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.