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Finding the Fourth Proportional to 33.09, 45.65 and 20.15

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Solution

The fourth proportional to 33.09, 45.65 and 20.15 is: 27.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    33.09 : 45.65 = 20.15 : x
  2. Step 2: Convert to fraction form
    33.09/45.65 = 20.15/x
  3. Step 3: Cross multiply
    33.09x = 45.65 × 20.15
  4. Step 4: Simplify right side
    33.09x = 919.85
  5. Step 5: Solve for x
    x = 919.85/33.09
  6. Step 6: Final answer
    x = 27.80

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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.