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Finding the Fourth Proportional to 15.12, 20.84 and 11.84

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Solution

The fourth proportional to 15.12, 20.84 and 11.84 is: 16.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.12 : 20.84 = 11.84 : x
  2. Step 2: Convert to fraction form
    15.12/20.84 = 11.84/x
  3. Step 3: Cross multiply
    15.12x = 20.84 × 11.84
  4. Step 4: Simplify right side
    15.12x = 246.58
  5. Step 5: Solve for x
    x = 246.58/15.12
  6. Step 6: Final answer
    x = 16.31

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Why These Related Problems?

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