Home / 3,986.29-5,979.39-1,389.22

Finding the Fourth Proportional to 3,986.29, 5,979.39 and 1,389.22

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Solution

The fourth proportional to 3,986.29, 5,979.39 and 1,389.22 is: 2,083.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986.29 : 5,979.39 = 1,389.22 : x
  2. Step 2: Convert to fraction form
    3,986.29/5,979.39 = 1,389.22/x
  3. Step 3: Cross multiply
    3,986.29x = 5,979.39 × 1,389.22
  4. Step 4: Simplify right side
    3,986.29x = 8,306,688.18
  5. Step 5: Solve for x
    x = 8,306,688.18/3,986.29
  6. Step 6: Final answer
    x = 2,083.81

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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.