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Finding the Fourth Proportional to 251.94, 378.28 and 220.26

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Solution

The fourth proportional to 251.94, 378.28 and 220.26 is: 330.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.94 : 378.28 = 220.26 : x
  2. Step 2: Convert to fraction form
    251.94/378.28 = 220.26/x
  3. Step 3: Cross multiply
    251.94x = 378.28 × 220.26
  4. Step 4: Simplify right side
    251.94x = 83,319.95
  5. Step 5: Solve for x
    x = 83,319.95/251.94
  6. Step 6: Final answer
    x = 330.71

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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.