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Finding the Fourth Proportional to 285.42, 428.19 and 169.97

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Solution

The fourth proportional to 285.42, 428.19 and 169.97 is: 254.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.42 : 428.19 = 169.97 : x
  2. Step 2: Convert to fraction form
    285.42/428.19 = 169.97/x
  3. Step 3: Cross multiply
    285.42x = 428.19 × 169.97
  4. Step 4: Simplify right side
    285.42x = 72,777.31
  5. Step 5: Solve for x
    x = 72,777.31/285.42
  6. Step 6: Final answer
    x = 254.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.