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Finding the Fourth Proportional to 285.42, 425.21 and 271.66

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Solution

The fourth proportional to 285.42, 425.21 and 271.66 is: 404.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.42 : 425.21 = 271.66 : x
  2. Step 2: Convert to fraction form
    285.42/425.21 = 271.66/x
  3. Step 3: Cross multiply
    285.42x = 425.21 × 271.66
  4. Step 4: Simplify right side
    285.42x = 115,512.55
  5. Step 5: Solve for x
    x = 115,512.55/285.42
  6. Step 6: Final answer
    x = 404.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.