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Finding the Fourth Proportional to 20.31, 30.46 and 15.19

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Solution

The fourth proportional to 20.31, 30.46 and 15.19 is: 22.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.31 : 30.46 = 15.19 : x
  2. Step 2: Convert to fraction form
    20.31/30.46 = 15.19/x
  3. Step 3: Cross multiply
    20.31x = 30.46 × 15.19
  4. Step 4: Simplify right side
    20.31x = 462.69
  5. Step 5: Solve for x
    x = 462.69/20.31
  6. Step 6: Final answer
    x = 22.78

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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.