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Finding the Fourth Proportional to 383.45, 574.70 and 221.22

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Solution

The fourth proportional to 383.45, 574.70 and 221.22 is: 331.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.45 : 574.70 = 221.22 : x
  2. Step 2: Convert to fraction form
    383.45/574.70 = 221.22/x
  3. Step 3: Cross multiply
    383.45x = 574.70 × 221.22
  4. Step 4: Simplify right side
    383.45x = 127,134.03
  5. Step 5: Solve for x
    x = 127,134.03/383.45
  6. Step 6: Final answer
    x = 331.56

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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.