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Finding the Fourth Proportional to 285.66, 428.54 and 155.79

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Solution

The fourth proportional to 285.66, 428.54 and 155.79 is: 233.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.66 : 428.54 = 155.79 : x
  2. Step 2: Convert to fraction form
    285.66/428.54 = 155.79/x
  3. Step 3: Cross multiply
    285.66x = 428.54 × 155.79
  4. Step 4: Simplify right side
    285.66x = 66,761.47
  5. Step 5: Solve for x
    x = 66,761.47/285.66
  6. Step 6: Final answer
    x = 233.71

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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.