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Finding the Fourth Proportional to 238.55, 329.42 and 154.67

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Solution

The fourth proportional to 238.55, 329.42 and 154.67 is: 213.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.55 : 329.42 = 154.67 : x
  2. Step 2: Convert to fraction form
    238.55/329.42 = 154.67/x
  3. Step 3: Cross multiply
    238.55x = 329.42 × 154.67
  4. Step 4: Simplify right side
    238.55x = 50,950.57
  5. Step 5: Solve for x
    x = 50,950.57/238.55
  6. Step 6: Final answer
    x = 213.59

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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.