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Finding the Fourth Proportional to 129,198.69, 193,835.70 and 79,310.79

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Solution

The fourth proportional to 129,198.69, 193,835.70 and 79,310.79 is: 118,989.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,198.69 : 193,835.70 = 79,310.79 : x
  2. Step 2: Convert to fraction form
    129,198.69/193,835.70 = 79,310.79/x
  3. Step 3: Cross multiply
    129,198.69x = 193,835.70 × 79,310.79
  4. Step 4: Simplify right side
    129,198.69x = 15,373,262,497.20
  5. Step 5: Solve for x
    x = 15,373,262,497.20/129,198.69
  6. Step 6: Final answer
    x = 118,989.31

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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.