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Finding the Fourth Proportional to 16.90, 23.31 and 16.21

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Solution

The fourth proportional to 16.90, 23.31 and 16.21 is: 22.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    16.90 : 23.31 = 16.21 : x
  2. Step 2: Convert to fraction form
    16.90/23.31 = 16.21/x
  3. Step 3: Cross multiply
    16.90x = 23.31 × 16.21
  4. Step 4: Simplify right side
    16.90x = 377.80
  5. Step 5: Solve for x
    x = 377.80/16.90
  6. Step 6: Final answer
    x = 22.36

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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.