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Finding the Fourth Proportional to 128,889.54, 193,367.79 and 40,144.50

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Solution

The fourth proportional to 128,889.54, 193,367.79 and 40,144.50 is: 60,227.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,889.54 : 193,367.79 = 40,144.50 : x
  2. Step 2: Convert to fraction form
    128,889.54/193,367.79 = 40,144.50/x
  3. Step 3: Cross multiply
    128,889.54x = 193,367.79 × 40,144.50
  4. Step 4: Simplify right side
    128,889.54x = 7,762,653,245.66
  5. Step 5: Solve for x
    x = 7,762,653,245.66/128,889.54
  6. Step 6: Final answer
    x = 60,227.18

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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.