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Finding the Fourth Proportional to 111,967.12, 154,503.20 and 68,939.78

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Solution

The fourth proportional to 111,967.12, 154,503.20 and 68,939.78 is: 95,129.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,967.12 : 154,503.20 = 68,939.78 : x
  2. Step 2: Convert to fraction form
    111,967.12/154,503.20 = 68,939.78/x
  3. Step 3: Cross multiply
    111,967.12x = 154,503.20 × 68,939.78
  4. Step 4: Simplify right side
    111,967.12x = 10,651,416,617.30
  5. Step 5: Solve for x
    x = 10,651,416,617.30/111,967.12
  6. Step 6: Final answer
    x = 95,129.86

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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.