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Finding the Fourth Proportional to 20.39, 28.12 and 16.01

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Solution

The fourth proportional to 20.39, 28.12 and 16.01 is: 22.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.39 : 28.12 = 16.01 : x
  2. Step 2: Convert to fraction form
    20.39/28.12 = 16.01/x
  3. Step 3: Cross multiply
    20.39x = 28.12 × 16.01
  4. Step 4: Simplify right side
    20.39x = 450.23
  5. Step 5: Solve for x
    x = 450.23/20.39
  6. Step 6: Final answer
    x = 22.08

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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.