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Finding the Fourth Proportional to 18.95, 28.35 and 13.22

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Solution

The fourth proportional to 18.95, 28.35 and 13.22 is: 19.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.95 : 28.35 = 13.22 : x
  2. Step 2: Convert to fraction form
    18.95/28.35 = 13.22/x
  3. Step 3: Cross multiply
    18.95x = 28.35 × 13.22
  4. Step 4: Simplify right side
    18.95x = 374.79
  5. Step 5: Solve for x
    x = 374.79/18.95
  6. Step 6: Final answer
    x = 19.78

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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.