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Finding the Fourth Proportional to 18.01, 26.91 and 17.81

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Solution

The fourth proportional to 18.01, 26.91 and 17.81 is: 26.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.01 : 26.91 = 17.81 : x
  2. Step 2: Convert to fraction form
    18.01/26.91 = 17.81/x
  3. Step 3: Cross multiply
    18.01x = 26.91 × 17.81
  4. Step 4: Simplify right side
    18.01x = 479.27
  5. Step 5: Solve for x
    x = 479.27/18.01
  6. Step 6: Final answer
    x = 26.61

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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.