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Finding the Fourth Proportional to 36.08, 54.08 and 20.80

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Solution

The fourth proportional to 36.08, 54.08 and 20.80 is: 31.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    36.08 : 54.08 = 20.80 : x
  2. Step 2: Convert to fraction form
    36.08/54.08 = 20.80/x
  3. Step 3: Cross multiply
    36.08x = 54.08 × 20.80
  4. Step 4: Simplify right side
    36.08x = 1,124.59
  5. Step 5: Solve for x
    x = 1,124.59/36.08
  6. Step 6: Final answer
    x = 31.17

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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.