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Finding the Fourth Proportional to 20.33, 30.42 and 13.51

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Solution

The fourth proportional to 20.33, 30.42 and 13.51 is: 20.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.33 : 30.42 = 13.51 : x
  2. Step 2: Convert to fraction form
    20.33/30.42 = 13.51/x
  3. Step 3: Cross multiply
    20.33x = 30.42 × 13.51
  4. Step 4: Simplify right side
    20.33x = 410.97
  5. Step 5: Solve for x
    x = 410.97/20.33
  6. Step 6: Final answer
    x = 20.22

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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.