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Finding the Fourth Proportional to 111,978.11, 154,529.78 and 61,677.11

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Solution

The fourth proportional to 111,978.11, 154,529.78 and 61,677.11 is: 85,114.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,978.11 : 154,529.78 = 61,677.11 : x
  2. Step 2: Convert to fraction form
    111,978.11/154,529.78 = 61,677.11/x
  3. Step 3: Cross multiply
    111,978.11x = 154,529.78 × 61,677.11
  4. Step 4: Simplify right side
    111,978.11x = 9,530,949,158.30
  5. Step 5: Solve for x
    x = 9,530,949,158.30/111,978.11
  6. Step 6: Final answer
    x = 85,114.40

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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.