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Finding the Fourth Proportional to 393.93, 543.47 and 238.41

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Solution

The fourth proportional to 393.93, 543.47 and 238.41 is: 328.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.93 : 543.47 = 238.41 : x
  2. Step 2: Convert to fraction form
    393.93/543.47 = 238.41/x
  3. Step 3: Cross multiply
    393.93x = 543.47 × 238.41
  4. Step 4: Simplify right side
    393.93x = 129,567.49
  5. Step 5: Solve for x
    x = 129,567.49/393.93
  6. Step 6: Final answer
    x = 328.91

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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.