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Finding the Fourth Proportional to 123.15, 169.93 and 112.21

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Solution

The fourth proportional to 123.15, 169.93 and 112.21 is: 154.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.15 : 169.93 = 112.21 : x
  2. Step 2: Convert to fraction form
    123.15/169.93 = 112.21/x
  3. Step 3: Cross multiply
    123.15x = 169.93 × 112.21
  4. Step 4: Simplify right side
    123.15x = 19,067.85
  5. Step 5: Solve for x
    x = 19,067.85/123.15
  6. Step 6: Final answer
    x = 154.83

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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.