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Finding the Fourth Proportional to 16.81, 23.29 and 15.29

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Solution

The fourth proportional to 16.81, 23.29 and 15.29 is: 21.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    16.81 : 23.29 = 15.29 : x
  2. Step 2: Convert to fraction form
    16.81/23.29 = 15.29/x
  3. Step 3: Cross multiply
    16.81x = 23.29 × 15.29
  4. Step 4: Simplify right side
    16.81x = 356.04
  5. Step 5: Solve for x
    x = 356.04/16.81
  6. Step 6: Final answer
    x = 21.18

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.