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Finding the Fourth Proportional to 128,546.60, 192,819.90 and 86,556.20

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Solution

The fourth proportional to 128,546.60, 192,819.90 and 86,556.20 is: 129,834.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,546.60 : 192,819.90 = 86,556.20 : x
  2. Step 2: Convert to fraction form
    128,546.60/192,819.90 = 86,556.20/x
  3. Step 3: Cross multiply
    128,546.60x = 192,819.90 × 86,556.20
  4. Step 4: Simplify right side
    128,546.60x = 16,689,757,828.38
  5. Step 5: Solve for x
    x = 16,689,757,828.38/128,546.60
  6. Step 6: Final answer
    x = 129,834.30

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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.