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Finding the Fourth Proportional to 139,395.57, 192,375.39 and 78,966.70

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Solution

The fourth proportional to 139,395.57, 192,375.39 and 78,966.70 is: 108,979.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,395.57 : 192,375.39 = 78,966.70 : x
  2. Step 2: Convert to fraction form
    139,395.57/192,375.39 = 78,966.70/x
  3. Step 3: Cross multiply
    139,395.57x = 192,375.39 × 78,966.70
  4. Step 4: Simplify right side
    139,395.57x = 15,191,249,080.51
  5. Step 5: Solve for x
    x = 15,191,249,080.51/139,395.57
  6. Step 6: Final answer
    x = 108,979.43

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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.