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Finding the Fourth Proportional to 123.92, 171.72 and 122.36

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Solution

The fourth proportional to 123.92, 171.72 and 122.36 is: 169.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.92 : 171.72 = 122.36 : x
  2. Step 2: Convert to fraction form
    123.92/171.72 = 122.36/x
  3. Step 3: Cross multiply
    123.92x = 171.72 × 122.36
  4. Step 4: Simplify right side
    123.92x = 21,011.66
  5. Step 5: Solve for x
    x = 21,011.66/123.92
  6. Step 6: Final answer
    x = 169.56

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.