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Finding the Fourth Proportional to 254.71, 382.02 and 81.34

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Solution

The fourth proportional to 254.71, 382.02 and 81.34 is: 121.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.71 : 382.02 = 81.34 : x
  2. Step 2: Convert to fraction form
    254.71/382.02 = 81.34/x
  3. Step 3: Cross multiply
    254.71x = 382.02 × 81.34
  4. Step 4: Simplify right side
    254.71x = 31,072.25
  5. Step 5: Solve for x
    x = 31,072.25/254.71
  6. Step 6: Final answer
    x = 121.99

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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.