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Finding the Fourth Proportional to 393.31, 590.05 and 220.22

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Solution

The fourth proportional to 393.31, 590.05 and 220.22 is: 330.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.31 : 590.05 = 220.22 : x
  2. Step 2: Convert to fraction form
    393.31/590.05 = 220.22/x
  3. Step 3: Cross multiply
    393.31x = 590.05 × 220.22
  4. Step 4: Simplify right side
    393.31x = 129,942.43
  5. Step 5: Solve for x
    x = 129,942.43/393.31
  6. Step 6: Final answer
    x = 330.38

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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.