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Finding the Fourth Proportional to 18.42, 27.55 and 17.81

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Solution

The fourth proportional to 18.42, 27.55 and 17.81 is: 26.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.42 : 27.55 = 17.81 : x
  2. Step 2: Convert to fraction form
    18.42/27.55 = 17.81/x
  3. Step 3: Cross multiply
    18.42x = 27.55 × 17.81
  4. Step 4: Simplify right side
    18.42x = 490.65
  5. Step 5: Solve for x
    x = 490.65/18.42
  6. Step 6: Final answer
    x = 26.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.