Home / 3,986.60-5,979.92-1,389.51

Finding the Fourth Proportional to 3,986.60, 5,979.92 and 1,389.51

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Solution

The fourth proportional to 3,986.60, 5,979.92 and 1,389.51 is: 2,084.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986.60 : 5,979.92 = 1,389.51 : x
  2. Step 2: Convert to fraction form
    3,986.60/5,979.92 = 1,389.51/x
  3. Step 3: Cross multiply
    3,986.60x = 5,979.92 × 1,389.51
  4. Step 4: Simplify right side
    3,986.60x = 8,309,151.69
  5. Step 5: Solve for x
    x = 8,309,151.69/3,986.60
  6. Step 6: Final answer
    x = 2,084.27

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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.