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Finding the Fourth Proportional to 139,310.16, 192,247.47 and 78,884.97

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Solution

The fourth proportional to 139,310.16, 192,247.47 and 78,884.97 is: 108,860.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,310.16 : 192,247.47 = 78,884.97 : x
  2. Step 2: Convert to fraction form
    139,310.16/192,247.47 = 78,884.97/x
  3. Step 3: Cross multiply
    139,310.16x = 192,247.47 × 78,884.97
  4. Step 4: Simplify right side
    139,310.16x = 15,165,435,903.53
  5. Step 5: Solve for x
    x = 15,165,435,903.53/139,310.16
  6. Step 6: Final answer
    x = 108,860.95

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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.