Home / 3,986.64-5,980-1,389.56

Finding the Fourth Proportional to 3,986.64, 5,980 and 1,389.56

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Solution

The fourth proportional to 3,986.64, 5,980 and 1,389.56 is: 2,084.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986.64 : 5,980 = 1,389.56 : x
  2. Step 2: Convert to fraction form
    3,986.64/5,980 = 1,389.56/x
  3. Step 3: Cross multiply
    3,986.64x = 5,980 × 1,389.56
  4. Step 4: Simplify right side
    3,986.64x = 8,309,568.80
  5. Step 5: Solve for x
    x = 8,309,568.80/3,986.64
  6. Step 6: Final answer
    x = 2,084.35

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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.