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Finding the Fourth Proportional to 20.73, 31.02 and 12.15

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Solution

The fourth proportional to 20.73, 31.02 and 12.15 is: 18.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.73 : 31.02 = 12.15 : x
  2. Step 2: Convert to fraction form
    20.73/31.02 = 12.15/x
  3. Step 3: Cross multiply
    20.73x = 31.02 × 12.15
  4. Step 4: Simplify right side
    20.73x = 376.89
  5. Step 5: Solve for x
    x = 376.89/20.73
  6. Step 6: Final answer
    x = 18.18

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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.