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Finding the Fourth Proportional to 139,696.58, 192,785.44 and 86,012.56

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Solution

The fourth proportional to 139,696.58, 192,785.44 and 86,012.56 is: 118,699.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,696.58 : 192,785.44 = 86,012.56 : x
  2. Step 2: Convert to fraction form
    139,696.58/192,785.44 = 86,012.56/x
  3. Step 3: Cross multiply
    139,696.58x = 192,785.44 × 86,012.56
  4. Step 4: Simplify right side
    139,696.58x = 16,581,969,225.13
  5. Step 5: Solve for x
    x = 16,581,969,225.13/139,696.58
  6. Step 6: Final answer
    x = 118,699.89

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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.