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Finding the Fourth Proportional to 270.71, 405.76 and 133.85

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Solution

The fourth proportional to 270.71, 405.76 and 133.85 is: 200.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    270.71 : 405.76 = 133.85 : x
  2. Step 2: Convert to fraction form
    270.71/405.76 = 133.85/x
  3. Step 3: Cross multiply
    270.71x = 405.76 × 133.85
  4. Step 4: Simplify right side
    270.71x = 54,310.64
  5. Step 5: Solve for x
    x = 54,310.64/270.71
  6. Step 6: Final answer
    x = 200.62

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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.