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Finding the Fourth Proportional to 18.85, 28.12 and 16.31

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Solution

The fourth proportional to 18.85, 28.12 and 16.31 is: 24.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.85 : 28.12 = 16.31 : x
  2. Step 2: Convert to fraction form
    18.85/28.12 = 16.31/x
  3. Step 3: Cross multiply
    18.85x = 28.12 × 16.31
  4. Step 4: Simplify right side
    18.85x = 458.64
  5. Step 5: Solve for x
    x = 458.64/18.85
  6. Step 6: Final answer
    x = 24.33

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.