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Finding the Fourth Proportional to 254.98, 381.94 and 163.21

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Solution

The fourth proportional to 254.98, 381.94 and 163.21 is: 244.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.98 : 381.94 = 163.21 : x
  2. Step 2: Convert to fraction form
    254.98/381.94 = 163.21/x
  3. Step 3: Cross multiply
    254.98x = 381.94 × 163.21
  4. Step 4: Simplify right side
    254.98x = 62,335.61
  5. Step 5: Solve for x
    x = 62,335.61/254.98
  6. Step 6: Final answer
    x = 244.47

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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.