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Finding the Fourth Proportional to 2,205.65, 3,308.39 and 818.43

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Solution

The fourth proportional to 2,205.65, 3,308.39 and 818.43 is: 1,227.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,205.65 : 3,308.39 = 818.43 : x
  2. Step 2: Convert to fraction form
    2,205.65/3,308.39 = 818.43/x
  3. Step 3: Cross multiply
    2,205.65x = 3,308.39 × 818.43
  4. Step 4: Simplify right side
    2,205.65x = 2,707,685.63
  5. Step 5: Solve for x
    x = 2,707,685.63/2,205.65
  6. Step 6: Final answer
    x = 1,227.61

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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.