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Finding the Fourth Proportional to 34.23, 47.24 and 20.43

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Solution

The fourth proportional to 34.23, 47.24 and 20.43 is: 28.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.23 : 47.24 = 20.43 : x
  2. Step 2: Convert to fraction form
    34.23/47.24 = 20.43/x
  3. Step 3: Cross multiply
    34.23x = 47.24 × 20.43
  4. Step 4: Simplify right side
    34.23x = 965.11
  5. Step 5: Solve for x
    x = 965.11/34.23
  6. Step 6: Final answer
    x = 28.19

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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.