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Finding the Fourth Proportional to 172.40, 258.60 and 121.27

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Solution

The fourth proportional to 172.40, 258.60 and 121.27 is: 181.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.40 : 258.60 = 121.27 : x
  2. Step 2: Convert to fraction form
    172.40/258.60 = 121.27/x
  3. Step 3: Cross multiply
    172.40x = 258.60 × 121.27
  4. Step 4: Simplify right side
    172.40x = 31,361.68
  5. Step 5: Solve for x
    x = 31,361.68/172.40
  6. Step 6: Final answer
    x = 181.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.