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Finding the Fourth Proportional to 254.14, 381.21 and 107.90

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Solution

The fourth proportional to 254.14, 381.21 and 107.90 is: 161.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.14 : 381.21 = 107.90 : x
  2. Step 2: Convert to fraction form
    254.14/381.21 = 107.90/x
  3. Step 3: Cross multiply
    254.14x = 381.21 × 107.90
  4. Step 4: Simplify right side
    254.14x = 41,131.68
  5. Step 5: Solve for x
    x = 41,131.68/254.14
  6. Step 6: Final answer
    x = 161.85

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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.