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Finding the Fourth Proportional to 111,921.87, 154,447.52 and 61,617.63

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Solution

The fourth proportional to 111,921.87, 154,447.52 and 61,617.63 is: 85,029.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,921.87 : 154,447.52 = 61,617.63 : x
  2. Step 2: Convert to fraction form
    111,921.87/154,447.52 = 61,617.63/x
  3. Step 3: Cross multiply
    111,921.87x = 154,447.52 × 61,617.63
  4. Step 4: Simplify right side
    111,921.87x = 9,516,689,833.69
  5. Step 5: Solve for x
    x = 9,516,689,833.69/111,921.87
  6. Step 6: Final answer
    x = 85,029.76

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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.