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Finding the Fourth Proportional to 19.97, 30.11 and 18.67

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Solution

The fourth proportional to 19.97, 30.11 and 18.67 is: 28.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.97 : 30.11 = 18.67 : x
  2. Step 2: Convert to fraction form
    19.97/30.11 = 18.67/x
  3. Step 3: Cross multiply
    19.97x = 30.11 × 18.67
  4. Step 4: Simplify right side
    19.97x = 562.06
  5. Step 5: Solve for x
    x = 562.06/19.97
  6. Step 6: Final answer
    x = 28.14

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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.