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Finding the Fourth Proportional to 57,859.40, 86,789.10 and 20,914.76

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Solution

The fourth proportional to 57,859.40, 86,789.10 and 20,914.76 is: 31,372.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,859.40 : 86,789.10 = 20,914.76 : x
  2. Step 2: Convert to fraction form
    57,859.40/86,789.10 = 20,914.76/x
  3. Step 3: Cross multiply
    57,859.40x = 86,789.10 × 20,914.76
  4. Step 4: Simplify right side
    57,859.40x = 1,815,173,197.12
  5. Step 5: Solve for x
    x = 1,815,173,197.12/57,859.40
  6. Step 6: Final answer
    x = 31,372.14

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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.