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Finding the Fourth Proportional to 393.44, 543.28 and 238.40

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Solution

The fourth proportional to 393.44, 543.28 and 238.40 is: 329.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.44 : 543.28 = 238.40 : x
  2. Step 2: Convert to fraction form
    393.44/543.28 = 238.40/x
  3. Step 3: Cross multiply
    393.44x = 543.28 × 238.40
  4. Step 4: Simplify right side
    393.44x = 129,517.95
  5. Step 5: Solve for x
    x = 129,517.95/393.44
  6. Step 6: Final answer
    x = 329.19

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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.