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Finding the Fourth Proportional to 393.84, 543.60 and 238.64

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Solution

The fourth proportional to 393.84, 543.60 and 238.64 is: 329.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.84 : 543.60 = 238.64 : x
  2. Step 2: Convert to fraction form
    393.84/543.60 = 238.64/x
  3. Step 3: Cross multiply
    393.84x = 543.60 × 238.64
  4. Step 4: Simplify right side
    393.84x = 129,724.70
  5. Step 5: Solve for x
    x = 129,724.70/393.84
  6. Step 6: Final answer
    x = 329.38

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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.