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Finding the Fourth Proportional to 128,218.80, 192,328.20 and 126,469.20

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Solution

The fourth proportional to 128,218.80, 192,328.20 and 126,469.20 is: 189,703.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,218.80 : 192,328.20 = 126,469.20 : x
  2. Step 2: Convert to fraction form
    128,218.80/192,328.20 = 126,469.20/x
  3. Step 3: Cross multiply
    128,218.80x = 192,328.20 × 126,469.20
  4. Step 4: Simplify right side
    128,218.80x = 24,323,593,591.44
  5. Step 5: Solve for x
    x = 24,323,593,591.44/128,218.80
  6. Step 6: Final answer
    x = 189,703.80

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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.