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Finding the Fourth Proportional to 57,658.70, 86,500.20 and 18,219.80

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Solution

The fourth proportional to 57,658.70, 86,500.20 and 18,219.80 is: 27,333.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,658.70 : 86,500.20 = 18,219.80 : x
  2. Step 2: Convert to fraction form
    57,658.70/86,500.20 = 18,219.80/x
  3. Step 3: Cross multiply
    57,658.70x = 86,500.20 × 18,219.80
  4. Step 4: Simplify right side
    57,658.70x = 1,576,016,343.96
  5. Step 5: Solve for x
    x = 1,576,016,343.96/57,658.70
  6. Step 6: Final answer
    x = 27,333.54

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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.