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Finding the Fourth Proportional to 18.89, 28.36 and 12.91

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Solution

The fourth proportional to 18.89, 28.36 and 12.91 is: 19.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.89 : 28.36 = 12.91 : x
  2. Step 2: Convert to fraction form
    18.89/28.36 = 12.91/x
  3. Step 3: Cross multiply
    18.89x = 28.36 × 12.91
  4. Step 4: Simplify right side
    18.89x = 366.13
  5. Step 5: Solve for x
    x = 366.13/18.89
  6. Step 6: Final answer
    x = 19.38

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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.