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Finding the Fourth Proportional to 128,793.60, 193,190.40 and 86,803.20

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Solution

The fourth proportional to 128,793.60, 193,190.40 and 86,803.20 is: 130,204.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,793.60 : 193,190.40 = 86,803.20 : x
  2. Step 2: Convert to fraction form
    128,793.60/193,190.40 = 86,803.20/x
  3. Step 3: Cross multiply
    128,793.60x = 193,190.40 × 86,803.20
  4. Step 4: Simplify right side
    128,793.60x = 16,769,544,929.28
  5. Step 5: Solve for x
    x = 16,769,544,929.28/128,793.60
  6. Step 6: Final answer
    x = 130,204.80

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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.