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Finding the Fourth Proportional to 393.81, 543.42 and 236.55

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Solution

The fourth proportional to 393.81, 543.42 and 236.55 is: 326.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.81 : 543.42 = 236.55 : x
  2. Step 2: Convert to fraction form
    393.81/543.42 = 236.55/x
  3. Step 3: Cross multiply
    393.81x = 543.42 × 236.55
  4. Step 4: Simplify right side
    393.81x = 128,546.00
  5. Step 5: Solve for x
    x = 128,546.00/393.81
  6. Step 6: Final answer
    x = 326.42

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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.