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Finding the Fourth Proportional to 378.97, 568.38 and 135.46

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Solution

The fourth proportional to 378.97, 568.38 and 135.46 is: 203.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.97 : 568.38 = 135.46 : x
  2. Step 2: Convert to fraction form
    378.97/568.38 = 135.46/x
  3. Step 3: Cross multiply
    378.97x = 568.38 × 135.46
  4. Step 4: Simplify right side
    378.97x = 76,992.75
  5. Step 5: Solve for x
    x = 76,992.75/378.97
  6. Step 6: Final answer
    x = 203.16

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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.