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Finding the Fourth Proportional to 18.40, 27.54 and 13.64

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Solution

The fourth proportional to 18.40, 27.54 and 13.64 is: 20.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.40 : 27.54 = 13.64 : x
  2. Step 2: Convert to fraction form
    18.40/27.54 = 13.64/x
  3. Step 3: Cross multiply
    18.40x = 27.54 × 13.64
  4. Step 4: Simplify right side
    18.40x = 375.65
  5. Step 5: Solve for x
    x = 375.65/18.40
  6. Step 6: Final answer
    x = 20.42

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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.