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Finding the Fourth Proportional to 285.30, 394.08 and 220.60

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Solution

The fourth proportional to 285.30, 394.08 and 220.60 is: 304.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.30 : 394.08 = 220.60 : x
  2. Step 2: Convert to fraction form
    285.30/394.08 = 220.60/x
  3. Step 3: Cross multiply
    285.30x = 394.08 × 220.60
  4. Step 4: Simplify right side
    285.30x = 86,934.05
  5. Step 5: Solve for x
    x = 86,934.05/285.30
  6. Step 6: Final answer
    x = 304.71

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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.