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Finding the Fourth Proportional to 20.25, 28.00 and 19.29

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Solution

The fourth proportional to 20.25, 28.00 and 19.29 is: 26.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.25 : 28.00 = 19.29 : x
  2. Step 2: Convert to fraction form
    20.25/28.00 = 19.29/x
  3. Step 3: Cross multiply
    20.25x = 28.00 × 19.29
  4. Step 4: Simplify right side
    20.25x = 540.25
  5. Step 5: Solve for x
    x = 540.25/20.25
  6. Step 6: Final answer
    x = 26.68

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.