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Finding the Fourth Proportional to 254.82, 382.21 and 139.23

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Solution

The fourth proportional to 254.82, 382.21 and 139.23 is: 208.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.82 : 382.21 = 139.23 : x
  2. Step 2: Convert to fraction form
    254.82/382.21 = 139.23/x
  3. Step 3: Cross multiply
    254.82x = 382.21 × 139.23
  4. Step 4: Simplify right side
    254.82x = 53,214.75
  5. Step 5: Solve for x
    x = 53,214.75/254.82
  6. Step 6: Final answer
    x = 208.83

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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.