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Finding the Fourth Proportional to 20.53, 30.84 and 12.52

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Solution

The fourth proportional to 20.53, 30.84 and 12.52 is: 18.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.53 : 30.84 = 12.52 : x
  2. Step 2: Convert to fraction form
    20.53/30.84 = 12.52/x
  3. Step 3: Cross multiply
    20.53x = 30.84 × 12.52
  4. Step 4: Simplify right side
    20.53x = 386.12
  5. Step 5: Solve for x
    x = 386.12/20.53
  6. Step 6: Final answer
    x = 18.81

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.