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Finding the Fourth Proportional to 23.51, 35.31 and 20.81

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Solution

The fourth proportional to 23.51, 35.31 and 20.81 is: 31.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    23.51 : 35.31 = 20.81 : x
  2. Step 2: Convert to fraction form
    23.51/35.31 = 20.81/x
  3. Step 3: Cross multiply
    23.51x = 35.31 × 20.81
  4. Step 4: Simplify right side
    23.51x = 734.80
  5. Step 5: Solve for x
    x = 734.80/23.51
  6. Step 6: Final answer
    x = 31.25

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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.