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Finding the Fourth Proportional to 17.81, 26.59 and 13.81

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Solution

The fourth proportional to 17.81, 26.59 and 13.81 is: 20.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    17.81 : 26.59 = 13.81 : x
  2. Step 2: Convert to fraction form
    17.81/26.59 = 13.81/x
  3. Step 3: Cross multiply
    17.81x = 26.59 × 13.81
  4. Step 4: Simplify right side
    17.81x = 367.07
  5. Step 5: Solve for x
    x = 367.07/17.81
  6. Step 6: Final answer
    x = 20.61

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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.