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Finding the Fourth Proportional to 393.98, 543.61 and 238.70

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Solution

The fourth proportional to 393.98, 543.61 and 238.70 is: 329.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.98 : 543.61 = 238.70 : x
  2. Step 2: Convert to fraction form
    393.98/543.61 = 238.70/x
  3. Step 3: Cross multiply
    393.98x = 543.61 × 238.70
  4. Step 4: Simplify right side
    393.98x = 129,759.71
  5. Step 5: Solve for x
    x = 129,759.71/393.98
  6. Step 6: Final answer
    x = 329.36

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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.