Home / 2,221.20-3,331.80-905.22

Finding the Fourth Proportional to 2,221.20, 3,331.80 and 905.22

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Solution

The fourth proportional to 2,221.20, 3,331.80 and 905.22 is: 1,357.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,221.20 : 3,331.80 = 905.22 : x
  2. Step 2: Convert to fraction form
    2,221.20/3,331.80 = 905.22/x
  3. Step 3: Cross multiply
    2,221.20x = 3,331.80 × 905.22
  4. Step 4: Simplify right side
    2,221.20x = 3,016,012.00
  5. Step 5: Solve for x
    x = 3,016,012.00/2,221.20
  6. Step 6: Final answer
    x = 1,357.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.