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Finding the Fourth Proportional to 19.38, 28.85 and 18.96

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Solution

The fourth proportional to 19.38, 28.85 and 18.96 is: 28.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.38 : 28.85 = 18.96 : x
  2. Step 2: Convert to fraction form
    19.38/28.85 = 18.96/x
  3. Step 3: Cross multiply
    19.38x = 28.85 × 18.96
  4. Step 4: Simplify right side
    19.38x = 547.00
  5. Step 5: Solve for x
    x = 547.00/19.38
  6. Step 6: Final answer
    x = 28.22

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.