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Finding the Fourth Proportional to 378.82, 567.84 and 135.21

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Solution

The fourth proportional to 378.82, 567.84 and 135.21 is: 202.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.82 : 567.84 = 135.21 : x
  2. Step 2: Convert to fraction form
    378.82/567.84 = 135.21/x
  3. Step 3: Cross multiply
    378.82x = 567.84 × 135.21
  4. Step 4: Simplify right side
    378.82x = 76,777.65
  5. Step 5: Solve for x
    x = 76,777.65/378.82
  6. Step 6: Final answer
    x = 202.68

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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.