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Finding the Fourth Proportional to 128,638.54, 192,940.30 and 33,860.79

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Solution

The fourth proportional to 128,638.54, 192,940.30 and 33,860.79 is: 50,786.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,638.54 : 192,940.30 = 33,860.79 : x
  2. Step 2: Convert to fraction form
    128,638.54/192,940.30 = 33,860.79/x
  3. Step 3: Cross multiply
    128,638.54x = 192,940.30 × 33,860.79
  4. Step 4: Simplify right side
    128,638.54x = 6,533,110,290.05
  5. Step 5: Solve for x
    x = 6,533,110,290.05/128,638.54
  6. Step 6: Final answer
    x = 50,786.57

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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.