Home / 3,989.80-5,505.81-2,221.37

Finding the Fourth Proportional to 3,989.80, 5,505.81 and 2,221.37

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Solution

The fourth proportional to 3,989.80, 5,505.81 and 2,221.37 is: 3,065.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.80 : 5,505.81 = 2,221.37 : x
  2. Step 2: Convert to fraction form
    3,989.80/5,505.81 = 2,221.37/x
  3. Step 3: Cross multiply
    3,989.80x = 5,505.81 × 2,221.37
  4. Step 4: Simplify right side
    3,989.80x = 12,230,441.16
  5. Step 5: Solve for x
    x = 12,230,441.16/3,989.80
  6. Step 6: Final answer
    x = 3,065.43

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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.