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Finding the Fourth Proportional to 128,768.88, 177,310.20 and 114,219.60

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Solution

The fourth proportional to 128,768.88, 177,310.20 and 114,219.60 is: 157,276.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,768.88 : 177,310.20 = 114,219.60 : x
  2. Step 2: Convert to fraction form
    128,768.88/177,310.20 = 114,219.60/x
  3. Step 3: Cross multiply
    128,768.88x = 177,310.20 × 114,219.60
  4. Step 4: Simplify right side
    128,768.88x = 20,252,300,119.92
  5. Step 5: Solve for x
    x = 20,252,300,119.92/128,768.88
  6. Step 6: Final answer
    x = 157,276.36

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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.