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Finding the Fourth Proportional to 128,592.60, 177,453.78 and 71,229.62

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Solution

The fourth proportional to 128,592.60, 177,453.78 and 71,229.62 is: 98,294.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,592.60 : 177,453.78 = 71,229.62 : x
  2. Step 2: Convert to fraction form
    128,592.60/177,453.78 = 71,229.62/x
  3. Step 3: Cross multiply
    128,592.60x = 177,453.78 × 71,229.62
  4. Step 4: Simplify right side
    128,592.60x = 12,639,965,316.96
  5. Step 5: Solve for x
    x = 12,639,965,316.96/128,592.60
  6. Step 6: Final answer
    x = 98,294.66

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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.