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Finding the Fourth Proportional to 285.72, 394.42 and 220.44

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Solution

The fourth proportional to 285.72, 394.42 and 220.44 is: 304.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.72 : 394.42 = 220.44 : x
  2. Step 2: Convert to fraction form
    285.72/394.42 = 220.44/x
  3. Step 3: Cross multiply
    285.72x = 394.42 × 220.44
  4. Step 4: Simplify right side
    285.72x = 86,945.94
  5. Step 5: Solve for x
    x = 86,945.94/285.72
  6. Step 6: Final answer
    x = 304.30

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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.