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Finding the Fourth Proportional to 285.78, 394.28 and 161.43

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Solution

The fourth proportional to 285.78, 394.28 and 161.43 is: 222.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.78 : 394.28 = 161.43 : x
  2. Step 2: Convert to fraction form
    285.78/394.28 = 161.43/x
  3. Step 3: Cross multiply
    285.78x = 394.28 × 161.43
  4. Step 4: Simplify right side
    285.78x = 63,648.62
  5. Step 5: Solve for x
    x = 63,648.62/285.78
  6. Step 6: Final answer
    x = 222.72

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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.