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Finding the Fourth Proportional to 238.88, 329.70 and 139.31

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Solution

The fourth proportional to 238.88, 329.70 and 139.31 is: 192.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.88 : 329.70 = 139.31 : x
  2. Step 2: Convert to fraction form
    238.88/329.70 = 139.31/x
  3. Step 3: Cross multiply
    238.88x = 329.70 × 139.31
  4. Step 4: Simplify right side
    238.88x = 45,928.86
  5. Step 5: Solve for x
    x = 45,928.86/238.88
  6. Step 6: Final answer
    x = 192.27

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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.