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Finding the Fourth Proportional to 128,099.88, 192,149.82 and 39,387.87

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Solution

The fourth proportional to 128,099.88, 192,149.82 and 39,387.87 is: 59,081.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,099.88 : 192,149.82 = 39,387.87 : x
  2. Step 2: Convert to fraction form
    128,099.88/192,149.82 = 39,387.87/x
  3. Step 3: Cross multiply
    128,099.88x = 192,149.82 × 39,387.87
  4. Step 4: Simplify right side
    128,099.88x = 7,568,372,130.68
  5. Step 5: Solve for x
    x = 7,568,372,130.68/128,099.88
  6. Step 6: Final answer
    x = 59,081.81

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1.5x scale

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.