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Finding the Fourth Proportional to 128,626.80, 192,940.20 and 39,879.60

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Solution

The fourth proportional to 128,626.80, 192,940.20 and 39,879.60 is: 59,819.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,626.80 : 192,940.20 = 39,879.60 : x
  2. Step 2: Convert to fraction form
    128,626.80/192,940.20 = 39,879.60/x
  3. Step 3: Cross multiply
    128,626.80x = 192,940.20 × 39,879.60
  4. Step 4: Simplify right side
    128,626.80x = 7,694,377,999.92
  5. Step 5: Solve for x
    x = 7,694,377,999.92/128,626.80
  6. Step 6: Final answer
    x = 59,819.40

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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.