Home / 2,439.20-3,660.60-979.40

Finding the Fourth Proportional to 2,439.20, 3,660.60 and 979.40

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Solution

The fourth proportional to 2,439.20, 3,660.60 and 979.40 is: 1,469.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,439.20 : 3,660.60 = 979.40 : x
  2. Step 2: Convert to fraction form
    2,439.20/3,660.60 = 979.40/x
  3. Step 3: Cross multiply
    2,439.20x = 3,660.60 × 979.40
  4. Step 4: Simplify right side
    2,439.20x = 3,585,191.64
  5. Step 5: Solve for x
    x = 3,585,191.64/2,439.20
  6. Step 6: Final answer
    x = 1,469.82

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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.