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Finding the Fourth Proportional to 251.37, 378.53 and 208.44

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Solution

The fourth proportional to 251.37, 378.53 and 208.44 is: 313.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.37 : 378.53 = 208.44 : x
  2. Step 2: Convert to fraction form
    251.37/378.53 = 208.44/x
  3. Step 3: Cross multiply
    251.37x = 378.53 × 208.44
  4. Step 4: Simplify right side
    251.37x = 78,899.75
  5. Step 5: Solve for x
    x = 78,899.75/251.37
  6. Step 6: Final answer
    x = 313.88

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.