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Finding the Fourth Proportional to 20.36, 30.48 and 18.77

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Solution

The fourth proportional to 20.36, 30.48 and 18.77 is: 28.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.36 : 30.48 = 18.77 : x
  2. Step 2: Convert to fraction form
    20.36/30.48 = 18.77/x
  3. Step 3: Cross multiply
    20.36x = 30.48 × 18.77
  4. Step 4: Simplify right side
    20.36x = 571.96
  5. Step 5: Solve for x
    x = 571.96/20.36
  6. Step 6: Final answer
    x = 28.10

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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.