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Finding the Fourth Proportional to 3,786.62, 5,679.69 and 1,813.66

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Solution

The fourth proportional to 3,786.62, 5,679.69 and 1,813.66 is: 2,720.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,786.62 : 5,679.69 = 1,813.66 : x
  2. Step 2: Convert to fraction form
    3,786.62/5,679.69 = 1,813.66/x
  3. Step 3: Cross multiply
    3,786.62x = 5,679.69 × 1,813.66
  4. Step 4: Simplify right side
    3,786.62x = 10,301,026.57
  5. Step 5: Solve for x
    x = 10,301,026.57/3,786.62
  6. Step 6: Final answer
    x = 2,720.38

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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.