Home / 3,979.45-5,489.99-2,407.78

Finding the Fourth Proportional to 3,979.45, 5,489.99 and 2,407.78

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Solution

The fourth proportional to 3,979.45, 5,489.99 and 2,407.78 is: 3,321.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,979.45 : 5,489.99 = 2,407.78 : x
  2. Step 2: Convert to fraction form
    3,979.45/5,489.99 = 2,407.78/x
  3. Step 3: Cross multiply
    3,979.45x = 5,489.99 × 2,407.78
  4. Step 4: Simplify right side
    3,979.45x = 13,218,660.67
  5. Step 5: Solve for x
    x = 13,218,660.67/3,979.45
  6. Step 6: Final answer
    x = 3,321.73

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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.