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Finding the Fourth Proportional to 24.45, 33.75 and 20.80

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Solution

The fourth proportional to 24.45, 33.75 and 20.80 is: 28.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    24.45 : 33.75 = 20.80 : x
  2. Step 2: Convert to fraction form
    24.45/33.75 = 20.80/x
  3. Step 3: Cross multiply
    24.45x = 33.75 × 20.80
  4. Step 4: Simplify right side
    24.45x = 702.04
  5. Step 5: Solve for x
    x = 702.04/24.45
  6. Step 6: Final answer
    x = 28.72

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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.