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Finding the Fourth Proportional to 171.76, 236.78 and 122.55

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Solution

The fourth proportional to 171.76, 236.78 and 122.55 is: 168.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.76 : 236.78 = 122.55 : x
  2. Step 2: Convert to fraction form
    171.76/236.78 = 122.55/x
  3. Step 3: Cross multiply
    171.76x = 236.78 × 122.55
  4. Step 4: Simplify right side
    171.76x = 29,018.69
  5. Step 5: Solve for x
    x = 29,018.69/171.76
  6. Step 6: Final answer
    x = 168.95

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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.