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Finding the Fourth Proportional to 20.33, 28.05 and 13.05

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Solution

The fourth proportional to 20.33, 28.05 and 13.05 is: 18.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.33 : 28.05 = 13.05 : x
  2. Step 2: Convert to fraction form
    20.33/28.05 = 13.05/x
  3. Step 3: Cross multiply
    20.33x = 28.05 × 13.05
  4. Step 4: Simplify right side
    20.33x = 366.05
  5. Step 5: Solve for x
    x = 366.05/20.33
  6. Step 6: Final answer
    x = 18.01

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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.