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Finding the Fourth Proportional to 31.36, 43.26 and 18.42

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Solution

The fourth proportional to 31.36, 43.26 and 18.42 is: 25.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.36 : 43.26 = 18.42 : x
  2. Step 2: Convert to fraction form
    31.36/43.26 = 18.42/x
  3. Step 3: Cross multiply
    31.36x = 43.26 × 18.42
  4. Step 4: Simplify right side
    31.36x = 796.85
  5. Step 5: Solve for x
    x = 796.85/31.36
  6. Step 6: Final answer
    x = 25.41

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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.