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Finding the Fourth Proportional to 129,608.86, 193,974.18 and 79,720.60

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Solution

The fourth proportional to 129,608.86, 193,974.18 and 79,720.60 is: 119,310.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,608.86 : 193,974.18 = 79,720.60 : x
  2. Step 2: Convert to fraction form
    129,608.86/193,974.18 = 79,720.60/x
  3. Step 3: Cross multiply
    129,608.86x = 193,974.18 × 79,720.60
  4. Step 4: Simplify right side
    129,608.86x = 15,463,738,014.11
  5. Step 5: Solve for x
    x = 15,463,738,014.11/129,608.86
  6. Step 6: Final answer
    x = 119,310.81

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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.