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Finding the Fourth Proportional to 57,686.70, 86,530.05 and 18,255.90

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Solution

The fourth proportional to 57,686.70, 86,530.05 and 18,255.90 is: 27,383.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,686.70 : 86,530.05 = 18,255.90 : x
  2. Step 2: Convert to fraction form
    57,686.70/86,530.05 = 18,255.90/x
  3. Step 3: Cross multiply
    57,686.70x = 86,530.05 × 18,255.90
  4. Step 4: Simplify right side
    57,686.70x = 1,579,683,939.80
  5. Step 5: Solve for x
    x = 1,579,683,939.80/57,686.70
  6. Step 6: Final answer
    x = 27,383.85

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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.