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Finding the Fourth Proportional to 18.89, 28.32 and 12.79

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Solution

The fourth proportional to 18.89, 28.32 and 12.79 is: 19.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.89 : 28.32 = 12.79 : x
  2. Step 2: Convert to fraction form
    18.89/28.32 = 12.79/x
  3. Step 3: Cross multiply
    18.89x = 28.32 × 12.79
  4. Step 4: Simplify right side
    18.89x = 362.08
  5. Step 5: Solve for x
    x = 362.08/18.89
  6. Step 6: Final answer
    x = 19.17

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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.