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Finding the Fourth Proportional to 254.05, 379.34 and 208.49

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Solution

The fourth proportional to 254.05, 379.34 and 208.49 is: 311.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.05 : 379.34 = 208.49 : x
  2. Step 2: Convert to fraction form
    254.05/379.34 = 208.49/x
  3. Step 3: Cross multiply
    254.05x = 379.34 × 208.49
  4. Step 4: Simplify right side
    254.05x = 79,087.65
  5. Step 5: Solve for x
    x = 79,087.65/254.05
  6. Step 6: Final answer
    x = 311.31

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.