Home / 3,989.28-5,499.49-2,806.68

Finding the Fourth Proportional to 3,989.28, 5,499.49 and 2,806.68

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Solution

The fourth proportional to 3,989.28, 5,499.49 and 2,806.68 is: 3,869.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.28 : 5,499.49 = 2,806.68 : x
  2. Step 2: Convert to fraction form
    3,989.28/5,499.49 = 2,806.68/x
  3. Step 3: Cross multiply
    3,989.28x = 5,499.49 × 2,806.68
  4. Step 4: Simplify right side
    3,989.28x = 15,435,308.59
  5. Step 5: Solve for x
    x = 15,435,308.59/3,989.28
  6. Step 6: Final answer
    x = 3,869.20

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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.