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Finding the Fourth Proportional to 17.31, 23.91 and 15.12

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Solution

The fourth proportional to 17.31, 23.91 and 15.12 is: 20.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    17.31 : 23.91 = 15.12 : x
  2. Step 2: Convert to fraction form
    17.31/23.91 = 15.12/x
  3. Step 3: Cross multiply
    17.31x = 23.91 × 15.12
  4. Step 4: Simplify right side
    17.31x = 361.52
  5. Step 5: Solve for x
    x = 361.52/17.31
  6. Step 6: Final answer
    x = 20.88

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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.