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Finding the Fourth Proportional to 57,789.36, 86,169.60 and 57,679.20

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Solution

The fourth proportional to 57,789.36, 86,169.60 and 57,679.20 is: 86,005.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,789.36 : 86,169.60 = 57,679.20 : x
  2. Step 2: Convert to fraction form
    57,789.36/86,169.60 = 57,679.20/x
  3. Step 3: Cross multiply
    57,789.36x = 86,169.60 × 57,679.20
  4. Step 4: Simplify right side
    57,789.36x = 4,970,193,592.32
  5. Step 5: Solve for x
    x = 4,970,193,592.32/57,789.36
  6. Step 6: Final answer
    x = 86,005.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.