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Finding the Fourth Proportional to 23.86, 35.79 and 20.47

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Solution

The fourth proportional to 23.86, 35.79 and 20.47 is: 30.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    23.86 : 35.79 = 20.47 : x
  2. Step 2: Convert to fraction form
    23.86/35.79 = 20.47/x
  3. Step 3: Cross multiply
    23.86x = 35.79 × 20.47
  4. Step 4: Simplify right side
    23.86x = 732.64
  5. Step 5: Solve for x
    x = 732.64/23.86
  6. Step 6: Final answer
    x = 30.70

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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.