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Finding the Fourth Proportional to 111,921.91, 154,451.95 and 61,620.91

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Solution

The fourth proportional to 111,921.91, 154,451.95 and 61,620.91 is: 85,036.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,921.91 : 154,451.95 = 61,620.91 : x
  2. Step 2: Convert to fraction form
    111,921.91/154,451.95 = 61,620.91/x
  3. Step 3: Cross multiply
    111,921.91x = 154,451.95 × 61,620.91
  4. Step 4: Simplify right side
    111,921.91x = 9,517,469,710.27
  5. Step 5: Solve for x
    x = 9,517,469,710.27/111,921.91
  6. Step 6: Final answer
    x = 85,036.70

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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.