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Finding the Fourth Proportional to 172.98, 239.71 and 140.58

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Solution

The fourth proportional to 172.98, 239.71 and 140.58 is: 194.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.98 : 239.71 = 140.58 : x
  2. Step 2: Convert to fraction form
    172.98/239.71 = 140.58/x
  3. Step 3: Cross multiply
    172.98x = 239.71 × 140.58
  4. Step 4: Simplify right side
    172.98x = 33,698.43
  5. Step 5: Solve for x
    x = 33,698.43/172.98
  6. Step 6: Final answer
    x = 194.81

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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.