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Finding the Fourth Proportional to 128,109.60, 177,195.60 and 113,205.60

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Solution

The fourth proportional to 128,109.60, 177,195.60 and 113,205.60 is: 156,581.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,109.60 : 177,195.60 = 113,205.60 : x
  2. Step 2: Convert to fraction form
    128,109.60/177,195.60 = 113,205.60/x
  3. Step 3: Cross multiply
    128,109.60x = 177,195.60 × 113,205.60
  4. Step 4: Simplify right side
    128,109.60x = 20,059,534,215.36
  5. Step 5: Solve for x
    x = 20,059,534,215.36/128,109.60
  6. Step 6: Final answer
    x = 156,581.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.