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Finding the Fourth Proportional to 3,786.57, 5,679.90 and 2,487.69

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Solution

The fourth proportional to 3,786.57, 5,679.90 and 2,487.69 is: 3,731.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,786.57 : 5,679.90 = 2,487.69 : x
  2. Step 2: Convert to fraction form
    3,786.57/5,679.90 = 2,487.69/x
  3. Step 3: Cross multiply
    3,786.57x = 5,679.90 × 2,487.69
  4. Step 4: Simplify right side
    3,786.57x = 14,129,830.43
  5. Step 5: Solve for x
    x = 14,129,830.43/3,786.57
  6. Step 6: Final answer
    x = 3,731.56

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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.