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Finding the Fourth Proportional to 128,905.20, 193,876.20 and 115,426.80

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Solution

The fourth proportional to 128,905.20, 193,876.20 and 115,426.80 is: 173,604.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,905.20 : 193,876.20 = 115,426.80 : x
  2. Step 2: Convert to fraction form
    128,905.20/193,876.20 = 115,426.80/x
  3. Step 3: Cross multiply
    128,905.20x = 193,876.20 × 115,426.80
  4. Step 4: Simplify right side
    128,905.20x = 22,378,509,362.16
  5. Step 5: Solve for x
    x = 22,378,509,362.16/128,905.20
  6. Step 6: Final answer
    x = 173,604.40

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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.