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Finding the Fourth Proportional to 171.66, 236.70 and 122.43

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Solution

The fourth proportional to 171.66, 236.70 and 122.43 is: 168.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.66 : 236.70 = 122.43 : x
  2. Step 2: Convert to fraction form
    171.66/236.70 = 122.43/x
  3. Step 3: Cross multiply
    171.66x = 236.70 × 122.43
  4. Step 4: Simplify right side
    171.66x = 28,979.18
  5. Step 5: Solve for x
    x = 28,979.18/171.66
  6. Step 6: Final answer
    x = 168.82

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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.