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Finding the Fourth Proportional to 171.78, 237.12 and 122.79

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Solution

The fourth proportional to 171.78, 237.12 and 122.79 is: 169.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.78 : 237.12 = 122.79 : x
  2. Step 2: Convert to fraction form
    171.78/237.12 = 122.79/x
  3. Step 3: Cross multiply
    171.78x = 237.12 × 122.79
  4. Step 4: Simplify right side
    171.78x = 29,115.96
  5. Step 5: Solve for x
    x = 29,115.96/171.78
  6. Step 6: Final answer
    x = 169.50

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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.