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Finding the Fourth Proportional to 128,845.91, 177,754.86 and 86,418.11

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Solution

The fourth proportional to 128,845.91, 177,754.86 and 86,418.11 is: 119,221.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,845.91 : 177,754.86 = 86,418.11 : x
  2. Step 2: Convert to fraction form
    128,845.91/177,754.86 = 86,418.11/x
  3. Step 3: Cross multiply
    128,845.91x = 177,754.86 × 86,418.11
  4. Step 4: Simplify right side
    128,845.91x = 15,361,239,488.90
  5. Step 5: Solve for x
    x = 15,361,239,488.90/128,845.91
  6. Step 6: Final answer
    x = 119,221.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.