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Finding the Fourth Proportional to 33.58, 46.31 and 20.47

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Solution

The fourth proportional to 33.58, 46.31 and 20.47 is: 28.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    33.58 : 46.31 = 20.47 : x
  2. Step 2: Convert to fraction form
    33.58/46.31 = 20.47/x
  3. Step 3: Cross multiply
    33.58x = 46.31 × 20.47
  4. Step 4: Simplify right side
    33.58x = 947.66
  5. Step 5: Solve for x
    x = 947.66/33.58
  6. Step 6: Final answer
    x = 28.22

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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.