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Finding the Fourth Proportional to 13.65, 18.91 and 13.27

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Solution

The fourth proportional to 13.65, 18.91 and 13.27 is: 18.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.65 : 18.91 = 13.27 : x
  2. Step 2: Convert to fraction form
    13.65/18.91 = 13.27/x
  3. Step 3: Cross multiply
    13.65x = 18.91 × 13.27
  4. Step 4: Simplify right side
    13.65x = 250.94
  5. Step 5: Solve for x
    x = 250.94/13.65
  6. Step 6: Final answer
    x = 18.38

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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.