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Finding the Fourth Proportional to 21.73, 29.99 and 11.90

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Solution

The fourth proportional to 21.73, 29.99 and 11.90 is: 16.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.73 : 29.99 = 11.90 : x
  2. Step 2: Convert to fraction form
    21.73/29.99 = 11.90/x
  3. Step 3: Cross multiply
    21.73x = 29.99 × 11.90
  4. Step 4: Simplify right side
    21.73x = 356.73
  5. Step 5: Solve for x
    x = 356.73/21.73
  6. Step 6: Final answer
    x = 16.42

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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.