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Finding the Fourth Proportional to 20.10, 30.15 and 12.48

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Solution

The fourth proportional to 20.10, 30.15 and 12.48 is: 18.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.10 : 30.15 = 12.48 : x
  2. Step 2: Convert to fraction form
    20.10/30.15 = 12.48/x
  3. Step 3: Cross multiply
    20.10x = 30.15 × 12.48
  4. Step 4: Simplify right side
    20.10x = 376.27
  5. Step 5: Solve for x
    x = 376.27/20.10
  6. Step 6: Final answer
    x = 18.72

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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.