Home / 3,986.42-5,976.21-1,389.02

Finding the Fourth Proportional to 3,986.42, 5,976.21 and 1,389.02

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Solution

The fourth proportional to 3,986.42, 5,976.21 and 1,389.02 is: 2,082.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986.42 : 5,976.21 = 1,389.02 : x
  2. Step 2: Convert to fraction form
    3,986.42/5,976.21 = 1,389.02/x
  3. Step 3: Cross multiply
    3,986.42x = 5,976.21 × 1,389.02
  4. Step 4: Simplify right side
    3,986.42x = 8,301,075.21
  5. Step 5: Solve for x
    x = 8,301,075.21/3,986.42
  6. Step 6: Final answer
    x = 2,082.34

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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.