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Finding the Fourth Proportional to 139,296, 192,228.48 and 79,680

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Solution

The fourth proportional to 139,296, 192,228.48 and 79,680 is: 109,958.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,296 : 192,228.48 = 79,680 : x
  2. Step 2: Convert to fraction form
    139,296/192,228.48 = 79,680/x
  3. Step 3: Cross multiply
    139,296x = 192,228.48 × 79,680
  4. Step 4: Simplify right side
    139,296x = 15,316,765,286.40
  5. Step 5: Solve for x
    x = 15,316,765,286.40/139,296
  6. Step 6: Final answer
    x = 109,958.40

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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.