Home / 3,986.40-5,979.60-1,521.30

Finding the Fourth Proportional to 3,986.40, 5,979.60 and 1,521.30

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Solution

The fourth proportional to 3,986.40, 5,979.60 and 1,521.30 is: 2,281.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986.40 : 5,979.60 = 1,521.30 : x
  2. Step 2: Convert to fraction form
    3,986.40/5,979.60 = 1,521.30/x
  3. Step 3: Cross multiply
    3,986.40x = 5,979.60 × 1,521.30
  4. Step 4: Simplify right side
    3,986.40x = 9,096,765.48
  5. Step 5: Solve for x
    x = 9,096,765.48/3,986.40
  6. Step 6: Final answer
    x = 2,281.95

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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.