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Finding the Fourth Proportional to 378.91, 568.43 and 135.38

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Solution

The fourth proportional to 378.91, 568.43 and 135.38 is: 203.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.91 : 568.43 = 135.38 : x
  2. Step 2: Convert to fraction form
    378.91/568.43 = 135.38/x
  3. Step 3: Cross multiply
    378.91x = 568.43 × 135.38
  4. Step 4: Simplify right side
    378.91x = 76,951.21
  5. Step 5: Solve for x
    x = 76,951.21/378.91
  6. Step 6: Final answer
    x = 203.09

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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.