Home / 2,221.40-3,311.02-2,205.20

Finding the Fourth Proportional to 2,221.40, 3,311.02 and 2,205.20

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Solution

The fourth proportional to 2,221.40, 3,311.02 and 2,205.20 is: 3,286.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,221.40 : 3,311.02 = 2,205.20 : x
  2. Step 2: Convert to fraction form
    2,221.40/3,311.02 = 2,205.20/x
  3. Step 3: Cross multiply
    2,221.40x = 3,311.02 × 2,205.20
  4. Step 4: Simplify right side
    2,221.40x = 7,301,461.30
  5. Step 5: Solve for x
    x = 7,301,461.30/2,221.40
  6. Step 6: Final answer
    x = 3,286.87

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.