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Finding the Fourth Proportional to 23.29, 34.86 and 20.79

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Solution

The fourth proportional to 23.29, 34.86 and 20.79 is: 31.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    23.29 : 34.86 = 20.79 : x
  2. Step 2: Convert to fraction form
    23.29/34.86 = 20.79/x
  3. Step 3: Cross multiply
    23.29x = 34.86 × 20.79
  4. Step 4: Simplify right side
    23.29x = 724.74
  5. Step 5: Solve for x
    x = 724.74/23.29
  6. Step 6: Final answer
    x = 31.12

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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.