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Finding the Fourth Proportional to 172.97, 258.81 and 121.74

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Solution

The fourth proportional to 172.97, 258.81 and 121.74 is: 182.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.97 : 258.81 = 121.74 : x
  2. Step 2: Convert to fraction form
    172.97/258.81 = 121.74/x
  3. Step 3: Cross multiply
    172.97x = 258.81 × 121.74
  4. Step 4: Simplify right side
    172.97x = 31,507.53
  5. Step 5: Solve for x
    x = 31,507.53/172.97
  6. Step 6: Final answer
    x = 182.16

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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.