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Finding the Fourth Proportional to 139,286.28, 208,901.71 and 68,178.37

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Solution

The fourth proportional to 139,286.28, 208,901.71 and 68,178.37 is: 102,253.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,286.28 : 208,901.71 = 68,178.37 : x
  2. Step 2: Convert to fraction form
    139,286.28/208,901.71 = 68,178.37/x
  3. Step 3: Cross multiply
    139,286.28x = 208,901.71 × 68,178.37
  4. Step 4: Simplify right side
    139,286.28x = 14,242,578,078.01
  5. Step 5: Solve for x
    x = 14,242,578,078.01/139,286.28
  6. Step 6: Final answer
    x = 102,253.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.