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Finding the Fourth Proportional to 13.40, 18.45 and 12.11

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Solution

The fourth proportional to 13.40, 18.45 and 12.11 is: 16.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.40 : 18.45 = 12.11 : x
  2. Step 2: Convert to fraction form
    13.40/18.45 = 12.11/x
  3. Step 3: Cross multiply
    13.40x = 18.45 × 12.11
  4. Step 4: Simplify right side
    13.40x = 223.43
  5. Step 5: Solve for x
    x = 223.43/13.40
  6. Step 6: Final answer
    x = 16.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.