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Finding the Fourth Proportional to 128,608.20, 192,912.30 and 99,083.70

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Solution

The fourth proportional to 128,608.20, 192,912.30 and 99,083.70 is: 148,625.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,608.20 : 192,912.30 = 99,083.70 : x
  2. Step 2: Convert to fraction form
    128,608.20/192,912.30 = 99,083.70/x
  3. Step 3: Cross multiply
    128,608.20x = 192,912.30 × 99,083.70
  4. Step 4: Simplify right side
    128,608.20x = 19,114,464,459.51
  5. Step 5: Solve for x
    x = 19,114,464,459.51/128,608.20
  6. Step 6: Final answer
    x = 148,625.55

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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.