Home / 3,989.82-5,505.15-2,221.14

Finding the Fourth Proportional to 3,989.82, 5,505.15 and 2,221.14

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Solution

The fourth proportional to 3,989.82, 5,505.15 and 2,221.14 is: 3,064.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.82 : 5,505.15 = 2,221.14 : x
  2. Step 2: Convert to fraction form
    3,989.82/5,505.15 = 2,221.14/x
  3. Step 3: Cross multiply
    3,989.82x = 5,505.15 × 2,221.14
  4. Step 4: Simplify right side
    3,989.82x = 12,227,708.87
  5. Step 5: Solve for x
    x = 12,227,708.87/3,989.82
  6. Step 6: Final answer
    x = 3,064.73

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Half scale
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Double scale
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Similar ratio
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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.