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Finding the Fourth Proportional to 139,396.70, 192,355.50 and 77,309.19

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Solution

The fourth proportional to 139,396.70, 192,355.50 and 77,309.19 is: 106,680.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,396.70 : 192,355.50 = 77,309.19 : x
  2. Step 2: Convert to fraction form
    139,396.70/192,355.50 = 77,309.19/x
  3. Step 3: Cross multiply
    139,396.70x = 192,355.50 × 77,309.19
  4. Step 4: Simplify right side
    139,396.70x = 14,870,847,897.05
  5. Step 5: Solve for x
    x = 14,870,847,897.05/139,396.70
  6. Step 6: Final answer
    x = 106,680.06

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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.