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Finding the Fourth Proportional to 254.55, 381.87 and 139.11

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Solution

The fourth proportional to 254.55, 381.87 and 139.11 is: 208.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.55 : 381.87 = 139.11 : x
  2. Step 2: Convert to fraction form
    254.55/381.87 = 139.11/x
  3. Step 3: Cross multiply
    254.55x = 381.87 × 139.11
  4. Step 4: Simplify right side
    254.55x = 53,121.94
  5. Step 5: Solve for x
    x = 53,121.94/254.55
  6. Step 6: Final answer
    x = 208.69

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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.