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Finding the Fourth Proportional to 129,840.40, 194,760.60 and 91,786.60

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Solution

The fourth proportional to 129,840.40, 194,760.60 and 91,786.60 is: 137,679.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,840.40 : 194,760.60 = 91,786.60 : x
  2. Step 2: Convert to fraction form
    129,840.40/194,760.60 = 91,786.60/x
  3. Step 3: Cross multiply
    129,840.40x = 194,760.60 × 91,786.60
  4. Step 4: Simplify right side
    129,840.40x = 17,876,413,287.96
  5. Step 5: Solve for x
    x = 17,876,413,287.96/129,840.40
  6. Step 6: Final answer
    x = 137,679.90

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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.