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Finding the Fourth Proportional to 139,375.84, 192,296.28 and 78,936.88

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Solution

The fourth proportional to 139,375.84, 192,296.28 and 78,936.88 is: 108,908.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,375.84 : 192,296.28 = 78,936.88 : x
  2. Step 2: Convert to fraction form
    139,375.84/192,296.28 = 78,936.88/x
  3. Step 3: Cross multiply
    139,375.84x = 192,296.28 × 78,936.88
  4. Step 4: Simplify right side
    139,375.84x = 15,179,268,378.81
  5. Step 5: Solve for x
    x = 15,179,268,378.81/139,375.84
  6. Step 6: Final answer
    x = 108,908.89

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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.