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Finding the Fourth Proportional to 128,711.60, 193,067.40 and 39,964.40

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Solution

The fourth proportional to 128,711.60, 193,067.40 and 39,964.40 is: 59,946.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,711.60 : 193,067.40 = 39,964.40 : x
  2. Step 2: Convert to fraction form
    128,711.60/193,067.40 = 39,964.40/x
  3. Step 3: Cross multiply
    128,711.60x = 193,067.40 × 39,964.40
  4. Step 4: Simplify right side
    128,711.60x = 7,715,822,800.56
  5. Step 5: Solve for x
    x = 7,715,822,800.56/128,711.60
  6. Step 6: Final answer
    x = 59,946.60

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Similar ratio
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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.