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Finding the Fourth Proportional to 20.01, 27.60 and 15.42

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Solution

The fourth proportional to 20.01, 27.60 and 15.42 is: 21.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.01 : 27.60 = 15.42 : x
  2. Step 2: Convert to fraction form
    20.01/27.60 = 15.42/x
  3. Step 3: Cross multiply
    20.01x = 27.60 × 15.42
  4. Step 4: Simplify right side
    20.01x = 425.59
  5. Step 5: Solve for x
    x = 425.59/20.01
  6. Step 6: Final answer
    x = 21.27

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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.