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Finding the Fourth Proportional to 414.55, 620.75 and 221.23

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Solution

The fourth proportional to 414.55, 620.75 and 221.23 is: 331.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.55 : 620.75 = 221.23 : x
  2. Step 2: Convert to fraction form
    414.55/620.75 = 221.23/x
  3. Step 3: Cross multiply
    414.55x = 620.75 × 221.23
  4. Step 4: Simplify right side
    414.55x = 137,327.42
  5. Step 5: Solve for x
    x = 137,327.42/414.55
  6. Step 6: Final answer
    x = 331.27

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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.