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Finding the Fourth Proportional to 274.11, 378.21 and 163.56

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Solution

The fourth proportional to 274.11, 378.21 and 163.56 is: 225.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.11 : 378.21 = 163.56 : x
  2. Step 2: Convert to fraction form
    274.11/378.21 = 163.56/x
  3. Step 3: Cross multiply
    274.11x = 378.21 × 163.56
  4. Step 4: Simplify right side
    274.11x = 61,860.03
  5. Step 5: Solve for x
    x = 61,860.03/274.11
  6. Step 6: Final answer
    x = 225.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.