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Finding the Fourth Proportional to 13.25, 19.98 and 12.38

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Solution

The fourth proportional to 13.25, 19.98 and 12.38 is: 18.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.25 : 19.98 = 12.38 : x
  2. Step 2: Convert to fraction form
    13.25/19.98 = 12.38/x
  3. Step 3: Cross multiply
    13.25x = 19.98 × 12.38
  4. Step 4: Simplify right side
    13.25x = 247.38
  5. Step 5: Solve for x
    x = 247.38/13.25
  6. Step 6: Final answer
    x = 18.67

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.