Home / 3,986.36-5,979.32-1,389.48

Finding the Fourth Proportional to 3,986.36, 5,979.32 and 1,389.48

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Solution

The fourth proportional to 3,986.36, 5,979.32 and 1,389.48 is: 2,084.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986.36 : 5,979.32 = 1,389.48 : x
  2. Step 2: Convert to fraction form
    3,986.36/5,979.32 = 1,389.48/x
  3. Step 3: Cross multiply
    3,986.36x = 5,979.32 × 1,389.48
  4. Step 4: Simplify right side
    3,986.36x = 8,308,145.55
  5. Step 5: Solve for x
    x = 8,308,145.55/3,986.36
  6. Step 6: Final answer
    x = 2,084.14

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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.