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Finding the Fourth Proportional to 20.28, 30.30 and 15.18

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Solution

The fourth proportional to 20.28, 30.30 and 15.18 is: 22.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.28 : 30.30 = 15.18 : x
  2. Step 2: Convert to fraction form
    20.28/30.30 = 15.18/x
  3. Step 3: Cross multiply
    20.28x = 30.30 × 15.18
  4. Step 4: Simplify right side
    20.28x = 459.95
  5. Step 5: Solve for x
    x = 459.95/20.28
  6. Step 6: Final answer
    x = 22.68

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.