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Finding the Fourth Proportional to 238.75, 329.50 and 139.21

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Solution

The fourth proportional to 238.75, 329.50 and 139.21 is: 192.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.75 : 329.50 = 139.21 : x
  2. Step 2: Convert to fraction form
    238.75/329.50 = 139.21/x
  3. Step 3: Cross multiply
    238.75x = 329.50 × 139.21
  4. Step 4: Simplify right side
    238.75x = 45,869.70
  5. Step 5: Solve for x
    x = 45,869.70/238.75
  6. Step 6: Final answer
    x = 192.12

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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.