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Finding the Fourth Proportional to 139,351.94, 192,308.21 and 78,935.12

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Solution

The fourth proportional to 139,351.94, 192,308.21 and 78,935.12 is: 108,931.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,351.94 : 192,308.21 = 78,935.12 : x
  2. Step 2: Convert to fraction form
    139,351.94/192,308.21 = 78,935.12/x
  3. Step 3: Cross multiply
    139,351.94x = 192,308.21 × 78,935.12
  4. Step 4: Simplify right side
    139,351.94x = 15,179,871,719.43
  5. Step 5: Solve for x
    x = 15,179,871,719.43/139,351.94
  6. Step 6: Final answer
    x = 108,931.90

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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.