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Finding the Fourth Proportional to 23.21, 31.99 and 20.31

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Solution

The fourth proportional to 23.21, 31.99 and 20.31 is: 27.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    23.21 : 31.99 = 20.31 : x
  2. Step 2: Convert to fraction form
    23.21/31.99 = 20.31/x
  3. Step 3: Cross multiply
    23.21x = 31.99 × 20.31
  4. Step 4: Simplify right side
    23.21x = 649.72
  5. Step 5: Solve for x
    x = 649.72/23.21
  6. Step 6: Final answer
    x = 27.99

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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.