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Finding the Fourth Proportional to 271.78, 405.69 and 251.75

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Solution

The fourth proportional to 271.78, 405.69 and 251.75 is: 375.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    271.78 : 405.69 = 251.75 : x
  2. Step 2: Convert to fraction form
    271.78/405.69 = 251.75/x
  3. Step 3: Cross multiply
    271.78x = 405.69 × 251.75
  4. Step 4: Simplify right side
    271.78x = 102,132.46
  5. Step 5: Solve for x
    x = 102,132.46/271.78
  6. Step 6: Final answer
    x = 375.79

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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.