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Finding the Fourth Proportional to 285.26, 393.69 and 238.55

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Solution

The fourth proportional to 285.26, 393.69 and 238.55 is: 329.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.26 : 393.69 = 238.55 : x
  2. Step 2: Convert to fraction form
    285.26/393.69 = 238.55/x
  3. Step 3: Cross multiply
    285.26x = 393.69 × 238.55
  4. Step 4: Simplify right side
    285.26x = 93,914.75
  5. Step 5: Solve for x
    x = 93,914.75/285.26
  6. Step 6: Final answer
    x = 329.23

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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.