Home / 3,855.12-5,781.31-1,389.27

Finding the Fourth Proportional to 3,855.12, 5,781.31 and 1,389.27

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Solution

The fourth proportional to 3,855.12, 5,781.31 and 1,389.27 is: 2,083.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,855.12 : 5,781.31 = 1,389.27 : x
  2. Step 2: Convert to fraction form
    3,855.12/5,781.31 = 1,389.27/x
  3. Step 3: Cross multiply
    3,855.12x = 5,781.31 × 1,389.27
  4. Step 4: Simplify right side
    3,855.12x = 8,031,800.54
  5. Step 5: Solve for x
    x = 8,031,800.54/3,855.12
  6. Step 6: Final answer
    x = 2,083.41

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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.