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Finding the Fourth Proportional to 129,878.88, 194,821.56 and 36,391.92

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Solution

The fourth proportional to 129,878.88, 194,821.56 and 36,391.92 is: 54,588.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,878.88 : 194,821.56 = 36,391.92 : x
  2. Step 2: Convert to fraction form
    129,878.88/194,821.56 = 36,391.92/x
  3. Step 3: Cross multiply
    129,878.88x = 194,821.56 × 36,391.92
  4. Step 4: Simplify right side
    129,878.88x = 7,089,930,625.80
  5. Step 5: Solve for x
    x = 7,089,930,625.80/129,878.88
  6. Step 6: Final answer
    x = 54,588.79

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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.