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Finding the Fourth Proportional to 128,608.80, 192,913.20 and 66,400.80

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Solution

The fourth proportional to 128,608.80, 192,913.20 and 66,400.80 is: 99,601.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,608.80 : 192,913.20 = 66,400.80 : x
  2. Step 2: Convert to fraction form
    128,608.80/192,913.20 = 66,400.80/x
  3. Step 3: Cross multiply
    128,608.80x = 192,913.20 × 66,400.80
  4. Step 4: Simplify right side
    128,608.80x = 12,809,590,810.56
  5. Step 5: Solve for x
    x = 12,809,590,810.56/128,608.80
  6. Step 6: Final answer
    x = 99,601.20

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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.