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Finding the Fourth Proportional to 171.98, 238.33 and 139.58

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Solution

The fourth proportional to 171.98, 238.33 and 139.58 is: 193.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.98 : 238.33 = 139.58 : x
  2. Step 2: Convert to fraction form
    171.98/238.33 = 139.58/x
  3. Step 3: Cross multiply
    171.98x = 238.33 × 139.58
  4. Step 4: Simplify right side
    171.98x = 33,265.40
  5. Step 5: Solve for x
    x = 33,265.40/171.98
  6. Step 6: Final answer
    x = 193.43

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.