Home / 128,640.35-192,979.20-39,901

Finding the Fourth Proportional to 128,640.35, 192,979.20 and 39,901

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Solution

The fourth proportional to 128,640.35, 192,979.20 and 39,901 is: 59,857.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,640.35 : 192,979.20 = 39,901 : x
  2. Step 2: Convert to fraction form
    128,640.35/192,979.20 = 39,901/x
  3. Step 3: Cross multiply
    128,640.35x = 192,979.20 × 39,901
  4. Step 4: Simplify right side
    128,640.35x = 7,700,063,059.20
  5. Step 5: Solve for x
    x = 7,700,063,059.20/128,640.35
  6. Step 6: Final answer
    x = 59,857.29

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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.