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Finding the Fourth Proportional to 139,990.96, 193,183.32 and 76,330

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Solution

The fourth proportional to 139,990.96, 193,183.32 and 76,330 is: 105,333.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,990.96 : 193,183.32 = 76,330 : x
  2. Step 2: Convert to fraction form
    139,990.96/193,183.32 = 76,330/x
  3. Step 3: Cross multiply
    139,990.96x = 193,183.32 × 76,330
  4. Step 4: Simplify right side
    139,990.96x = 14,745,682,815.60
  5. Step 5: Solve for x
    x = 14,745,682,815.60/139,990.96
  6. Step 6: Final answer
    x = 105,333.11

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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.