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Finding the Fourth Proportional to 274.50, 378.48 and 239.88

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Solution

The fourth proportional to 274.50, 378.48 and 239.88 is: 330.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.50 : 378.48 = 239.88 : x
  2. Step 2: Convert to fraction form
    274.50/378.48 = 239.88/x
  3. Step 3: Cross multiply
    274.50x = 378.48 × 239.88
  4. Step 4: Simplify right side
    274.50x = 90,789.78
  5. Step 5: Solve for x
    x = 90,789.78/274.50
  6. Step 6: Final answer
    x = 330.75

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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.