Home / 3,989.36-5,505.90-2,221.40

Finding the Fourth Proportional to 3,989.36, 5,505.90 and 2,221.40

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Solution

The fourth proportional to 3,989.36, 5,505.90 and 2,221.40 is: 3,065.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.36 : 5,505.90 = 2,221.40 : x
  2. Step 2: Convert to fraction form
    3,989.36/5,505.90 = 2,221.40/x
  3. Step 3: Cross multiply
    3,989.36x = 5,505.90 × 2,221.40
  4. Step 4: Simplify right side
    3,989.36x = 12,230,806.26
  5. Step 5: Solve for x
    x = 12,230,806.26/3,989.36
  6. Step 6: Final answer
    x = 3,065.86

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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.