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Finding the Fourth Proportional to 128,816.83, 193,280.87 and 69,694.12

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Solution

The fourth proportional to 128,816.83, 193,280.87 and 69,694.12 is: 104,571.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,816.83 : 193,280.87 = 69,694.12 : x
  2. Step 2: Convert to fraction form
    128,816.83/193,280.87 = 69,694.12/x
  3. Step 3: Cross multiply
    128,816.83x = 193,280.87 × 69,694.12
  4. Step 4: Simplify right side
    128,816.83x = 13,470,540,147.48
  5. Step 5: Solve for x
    x = 13,470,540,147.48/128,816.83
  6. Step 6: Final answer
    x = 104,571.27

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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.