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Finding the Fourth Proportional to 111,968.88, 154,506.85 and 66,639.54

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Solution

The fourth proportional to 111,968.88, 154,506.85 and 66,639.54 is: 91,956.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,968.88 : 154,506.85 = 66,639.54 : x
  2. Step 2: Convert to fraction form
    111,968.88/154,506.85 = 66,639.54/x
  3. Step 3: Cross multiply
    111,968.88x = 154,506.85 × 66,639.54
  4. Step 4: Simplify right side
    111,968.88x = 10,296,265,410.85
  5. Step 5: Solve for x
    x = 10,296,265,410.85/111,968.88
  6. Step 6: Final answer
    x = 91,956.49

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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.