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Finding the Fourth Proportional to 139,352.12, 192,308 and 78,921.24

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Solution

The fourth proportional to 139,352.12, 192,308 and 78,921.24 is: 108,912.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,352.12 : 192,308 = 78,921.24 : x
  2. Step 2: Convert to fraction form
    139,352.12/192,308 = 78,921.24/x
  3. Step 3: Cross multiply
    139,352.12x = 192,308 × 78,921.24
  4. Step 4: Simplify right side
    139,352.12x = 15,177,185,821.92
  5. Step 5: Solve for x
    x = 15,177,185,821.92/139,352.12
  6. Step 6: Final answer
    x = 108,912.49

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.