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Finding the Fourth Proportional to 111,919.91, 154,449.20 and 61,618.91

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Solution

The fourth proportional to 111,919.91, 154,449.20 and 61,618.91 is: 85,033.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,919.91 : 154,449.20 = 61,618.91 : x
  2. Step 2: Convert to fraction form
    111,919.91/154,449.20 = 61,618.91/x
  3. Step 3: Cross multiply
    111,919.91x = 154,449.20 × 61,618.91
  4. Step 4: Simplify right side
    111,919.91x = 9,516,991,046.28
  5. Step 5: Solve for x
    x = 9,516,991,046.28/111,919.91
  6. Step 6: Final answer
    x = 85,033.94

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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.