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Finding the Fourth Proportional to 2,766.80, 4,149.63 and 818.55

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Solution

The fourth proportional to 2,766.80, 4,149.63 and 818.55 is: 1,227.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,766.80 : 4,149.63 = 818.55 : x
  2. Step 2: Convert to fraction form
    2,766.80/4,149.63 = 818.55/x
  3. Step 3: Cross multiply
    2,766.80x = 4,149.63 × 818.55
  4. Step 4: Simplify right side
    2,766.80x = 3,396,679.64
  5. Step 5: Solve for x
    x = 3,396,679.64/2,766.80
  6. Step 6: Final answer
    x = 1,227.66

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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.