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Finding the Fourth Proportional to 238.43, 328.92 and 138.85

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Solution

The fourth proportional to 238.43, 328.92 and 138.85 is: 191.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.43 : 328.92 = 138.85 : x
  2. Step 2: Convert to fraction form
    238.43/328.92 = 138.85/x
  3. Step 3: Cross multiply
    238.43x = 328.92 × 138.85
  4. Step 4: Simplify right side
    238.43x = 45,668.90
  5. Step 5: Solve for x
    x = 45,668.90/238.43
  6. Step 6: Final answer
    x = 191.54

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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.