Home / 3,990.39-5,505.94-2,221.66

Finding the Fourth Proportional to 3,990.39, 5,505.94 and 2,221.66

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Solution

The fourth proportional to 3,990.39, 5,505.94 and 2,221.66 is: 3,065.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.39 : 5,505.94 = 2,221.66 : x
  2. Step 2: Convert to fraction form
    3,990.39/5,505.94 = 2,221.66/x
  3. Step 3: Cross multiply
    3,990.39x = 5,505.94 × 2,221.66
  4. Step 4: Simplify right side
    3,990.39x = 12,232,288.02
  5. Step 5: Solve for x
    x = 12,232,288.02/3,990.39
  6. Step 6: Final answer
    x = 3,065.44

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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.