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Finding the Fourth Proportional to 129,205.70, 193,846.20 and 79,317.80

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Solution

The fourth proportional to 129,205.70, 193,846.20 and 79,317.80 is: 118,999.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,205.70 : 193,846.20 = 79,317.80 : x
  2. Step 2: Convert to fraction form
    129,205.70/193,846.20 = 79,317.80/x
  3. Step 3: Cross multiply
    129,205.70x = 193,846.20 × 79,317.80
  4. Step 4: Simplify right side
    129,205.70x = 15,375,454,122.36
  5. Step 5: Solve for x
    x = 15,375,454,122.36/129,205.70
  6. Step 6: Final answer
    x = 118,999.81

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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.