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Finding the Fourth Proportional to 128,017.20, 191,872.20 and 65,655.60

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Solution

The fourth proportional to 128,017.20, 191,872.20 and 65,655.60 is: 98,404.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,017.20 : 191,872.20 = 65,655.60 : x
  2. Step 2: Convert to fraction form
    128,017.20/191,872.20 = 65,655.60/x
  3. Step 3: Cross multiply
    128,017.20x = 191,872.20 × 65,655.60
  4. Step 4: Simplify right side
    128,017.20x = 12,597,484,414.32
  5. Step 5: Solve for x
    x = 12,597,484,414.32/128,017.20
  6. Step 6: Final answer
    x = 98,404.62

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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.