Home / 3,979.38-5,489.90-2,718.40

Finding the Fourth Proportional to 3,979.38, 5,489.90 and 2,718.40

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Solution

The fourth proportional to 3,979.38, 5,489.90 and 2,718.40 is: 3,750.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,979.38 : 5,489.90 = 2,718.40 : x
  2. Step 2: Convert to fraction form
    3,979.38/5,489.90 = 2,718.40/x
  3. Step 3: Cross multiply
    3,979.38x = 5,489.90 × 2,718.40
  4. Step 4: Simplify right side
    3,979.38x = 14,923,744.16
  5. Step 5: Solve for x
    x = 14,923,744.16/3,979.38
  6. Step 6: Final answer
    x = 3,750.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.