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Finding the Fourth Proportional to 20.26, 30.48 and 18.49

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Solution

The fourth proportional to 20.26, 30.48 and 18.49 is: 27.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.26 : 30.48 = 18.49 : x
  2. Step 2: Convert to fraction form
    20.26/30.48 = 18.49/x
  3. Step 3: Cross multiply
    20.26x = 30.48 × 18.49
  4. Step 4: Simplify right side
    20.26x = 563.58
  5. Step 5: Solve for x
    x = 563.58/20.26
  6. Step 6: Final answer
    x = 27.82

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1.5x scale

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.