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Finding the Fourth Proportional to 139,269.83, 192,193.15 and 81,911.57

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Solution

The fourth proportional to 139,269.83, 192,193.15 and 81,911.57 is: 113,038.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,269.83 : 192,193.15 = 81,911.57 : x
  2. Step 2: Convert to fraction form
    139,269.83/192,193.15 = 81,911.57/x
  3. Step 3: Cross multiply
    139,269.83x = 192,193.15 × 81,911.57
  4. Step 4: Simplify right side
    139,269.83x = 15,742,841,854.36
  5. Step 5: Solve for x
    x = 15,742,841,854.36/139,269.83
  6. Step 6: Final answer
    x = 113,038.42

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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.