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Finding the Fourth Proportional to 378.79, 568.15 and 135.25

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Solution

The fourth proportional to 378.79, 568.15 and 135.25 is: 202.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.79 : 568.15 = 135.25 : x
  2. Step 2: Convert to fraction form
    378.79/568.15 = 135.25/x
  3. Step 3: Cross multiply
    378.79x = 568.15 × 135.25
  4. Step 4: Simplify right side
    378.79x = 76,842.29
  5. Step 5: Solve for x
    x = 76,842.29/378.79
  6. Step 6: Final answer
    x = 202.86

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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.