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Finding the Fourth Proportional to 136,694.96, 188,640.60 and 77,078.96

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Solution

The fourth proportional to 136,694.96, 188,640.60 and 77,078.96 is: 106,369.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,694.96 : 188,640.60 = 77,078.96 : x
  2. Step 2: Convert to fraction form
    136,694.96/188,640.60 = 77,078.96/x
  3. Step 3: Cross multiply
    136,694.96x = 188,640.60 × 77,078.96
  4. Step 4: Simplify right side
    136,694.96x = 14,540,221,261.78
  5. Step 5: Solve for x
    x = 14,540,221,261.78/136,694.96
  6. Step 6: Final answer
    x = 106,369.84

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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.