Home / 2,205.40-3,286.62-2,138.66

Finding the Fourth Proportional to 2,205.40, 3,286.62 and 2,138.66

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Solution

The fourth proportional to 2,205.40, 3,286.62 and 2,138.66 is: 3,187.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,205.40 : 3,286.62 = 2,138.66 : x
  2. Step 2: Convert to fraction form
    2,205.40/3,286.62 = 2,138.66/x
  3. Step 3: Cross multiply
    2,205.40x = 3,286.62 × 2,138.66
  4. Step 4: Simplify right side
    2,205.40x = 7,028,962.73
  5. Step 5: Solve for x
    x = 7,028,962.73/2,205.40
  6. Step 6: Final answer
    x = 3,187.16

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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.