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Finding the Fourth Proportional to 171.36, 236.49 and 121.57

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Solution

The fourth proportional to 171.36, 236.49 and 121.57 is: 167.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.36 : 236.49 = 121.57 : x
  2. Step 2: Convert to fraction form
    171.36/236.49 = 121.57/x
  3. Step 3: Cross multiply
    171.36x = 236.49 × 121.57
  4. Step 4: Simplify right side
    171.36x = 28,750.09
  5. Step 5: Solve for x
    x = 28,750.09/171.36
  6. Step 6: Final answer
    x = 167.78

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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.