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Finding the Fourth Proportional to 254.34, 351.11 and 208.21

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Solution

The fourth proportional to 254.34, 351.11 and 208.21 is: 287.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.34 : 351.11 = 208.21 : x
  2. Step 2: Convert to fraction form
    254.34/351.11 = 208.21/x
  3. Step 3: Cross multiply
    254.34x = 351.11 × 208.21
  4. Step 4: Simplify right side
    254.34x = 73,103.83
  5. Step 5: Solve for x
    x = 73,103.83/254.34
  6. Step 6: Final answer
    x = 287.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.