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Finding the Fourth Proportional to 128,511.78, 192,736.62 and 49,575.66

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Solution

The fourth proportional to 128,511.78, 192,736.62 and 49,575.66 is: 74,351.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,511.78 : 192,736.62 = 49,575.66 : x
  2. Step 2: Convert to fraction form
    128,511.78/192,736.62 = 49,575.66/x
  3. Step 3: Cross multiply
    128,511.78x = 192,736.62 × 49,575.66
  4. Step 4: Simplify right side
    128,511.78x = 9,555,045,142.67
  5. Step 5: Solve for x
    x = 9,555,045,142.67/128,511.78
  6. Step 6: Final answer
    x = 74,351.51

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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.