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Finding the Fourth Proportional to 15.12, 20.97 and 14.47

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Solution

The fourth proportional to 15.12, 20.97 and 14.47 is: 20.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.12 : 20.97 = 14.47 : x
  2. Step 2: Convert to fraction form
    15.12/20.97 = 14.47/x
  3. Step 3: Cross multiply
    15.12x = 20.97 × 14.47
  4. Step 4: Simplify right side
    15.12x = 303.44
  5. Step 5: Solve for x
    x = 303.44/15.12
  6. Step 6: Final answer
    x = 20.07

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.