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Finding the Fourth Proportional to 275.25, 378.96 and 238.20

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Solution

The fourth proportional to 275.25, 378.96 and 238.20 is: 327.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.25 : 378.96 = 238.20 : x
  2. Step 2: Convert to fraction form
    275.25/378.96 = 238.20/x
  3. Step 3: Cross multiply
    275.25x = 378.96 × 238.20
  4. Step 4: Simplify right side
    275.25x = 90,268.27
  5. Step 5: Solve for x
    x = 90,268.27/275.25
  6. Step 6: Final answer
    x = 327.95

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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.