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Finding the Fourth Proportional to 285.21, 394.08 and 220.28

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Solution

The fourth proportional to 285.21, 394.08 and 220.28 is: 304.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.21 : 394.08 = 220.28 : x
  2. Step 2: Convert to fraction form
    285.21/394.08 = 220.28/x
  3. Step 3: Cross multiply
    285.21x = 394.08 × 220.28
  4. Step 4: Simplify right side
    285.21x = 86,805.97
  5. Step 5: Solve for x
    x = 86,805.97/285.21
  6. Step 6: Final answer
    x = 304.36

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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.