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Finding the Fourth Proportional to 139,679.50, 192,724.09 and 82,321.11

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Solution

The fourth proportional to 139,679.50, 192,724.09 and 82,321.11 is: 113,583.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,679.50 : 192,724.09 = 82,321.11 : x
  2. Step 2: Convert to fraction form
    139,679.50/192,724.09 = 82,321.11/x
  3. Step 3: Cross multiply
    139,679.50x = 192,724.09 × 82,321.11
  4. Step 4: Simplify right side
    139,679.50x = 15,865,261,012.54
  5. Step 5: Solve for x
    x = 15,865,261,012.54/139,679.50
  6. Step 6: Final answer
    x = 113,583.32

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1.5x scale

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.