Home / 3,989.57-5,505.62-2,221.20

Finding the Fourth Proportional to 3,989.57, 5,505.62 and 2,221.20

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Solution

The fourth proportional to 3,989.57, 5,505.62 and 2,221.20 is: 3,065.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.57 : 5,505.62 = 2,221.20 : x
  2. Step 2: Convert to fraction form
    3,989.57/5,505.62 = 2,221.20/x
  3. Step 3: Cross multiply
    3,989.57x = 5,505.62 × 2,221.20
  4. Step 4: Simplify right side
    3,989.57x = 12,229,072.04
  5. Step 5: Solve for x
    x = 12,229,072.04/3,989.57
  6. Step 6: Final answer
    x = 3,065.26

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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.