Home / 3,986.24-5,979.68-1,389.20

Finding the Fourth Proportional to 3,986.24, 5,979.68 and 1,389.20

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Solution

The fourth proportional to 3,986.24, 5,979.68 and 1,389.20 is: 2,083.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986.24 : 5,979.68 = 1,389.20 : x
  2. Step 2: Convert to fraction form
    3,986.24/5,979.68 = 1,389.20/x
  3. Step 3: Cross multiply
    3,986.24x = 5,979.68 × 1,389.20
  4. Step 4: Simplify right side
    3,986.24x = 8,306,971.46
  5. Step 5: Solve for x
    x = 8,306,971.46/3,986.24
  6. Step 6: Final answer
    x = 2,083.91

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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.