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Finding the Fourth Proportional to 23.90, 35.81 and 20.55

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Solution

The fourth proportional to 23.90, 35.81 and 20.55 is: 30.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    23.90 : 35.81 = 20.55 : x
  2. Step 2: Convert to fraction form
    23.90/35.81 = 20.55/x
  3. Step 3: Cross multiply
    23.90x = 35.81 × 20.55
  4. Step 4: Simplify right side
    23.90x = 735.95
  5. Step 5: Solve for x
    x = 735.95/23.90
  6. Step 6: Final answer
    x = 30.80

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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.