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Finding the Fourth Proportional to 274.88, 378.72 and 239.64

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Solution

The fourth proportional to 274.88, 378.72 and 239.64 is: 330.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.88 : 378.72 = 239.64 : x
  2. Step 2: Convert to fraction form
    274.88/378.72 = 239.64/x
  3. Step 3: Cross multiply
    274.88x = 378.72 × 239.64
  4. Step 4: Simplify right side
    274.88x = 90,756.46
  5. Step 5: Solve for x
    x = 90,756.46/274.88
  6. Step 6: Final answer
    x = 330.17

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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.