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Finding the Fourth Proportional to 2,213.40, 3,318 and 826.38

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Solution

The fourth proportional to 2,213.40, 3,318 and 826.38 is: 1,238.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,213.40 : 3,318 = 826.38 : x
  2. Step 2: Convert to fraction form
    2,213.40/3,318 = 826.38/x
  3. Step 3: Cross multiply
    2,213.40x = 3,318 × 826.38
  4. Step 4: Simplify right side
    2,213.40x = 2,741,928.84
  5. Step 5: Solve for x
    x = 2,741,928.84/2,213.40
  6. Step 6: Final answer
    x = 1,238.79

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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.