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Finding the Fourth Proportional to 26.80, 36.99 and 20.98

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Solution

The fourth proportional to 26.80, 36.99 and 20.98 is: 28.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.80 : 36.99 = 20.98 : x
  2. Step 2: Convert to fraction form
    26.80/36.99 = 20.98/x
  3. Step 3: Cross multiply
    26.80x = 36.99 × 20.98
  4. Step 4: Simplify right side
    26.80x = 776.05
  5. Step 5: Solve for x
    x = 776.05/26.80
  6. Step 6: Final answer
    x = 28.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.