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Finding the Fourth Proportional to 611.28, 843.39 and 445.55

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Solution

The fourth proportional to 611.28, 843.39 and 445.55 is: 614.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.28 : 843.39 = 445.55 : x
  2. Step 2: Convert to fraction form
    611.28/843.39 = 445.55/x
  3. Step 3: Cross multiply
    611.28x = 843.39 × 445.55
  4. Step 4: Simplify right side
    611.28x = 375,772.41
  5. Step 5: Solve for x
    x = 375,772.41/611.28
  6. Step 6: Final answer
    x = 614.73

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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.