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Finding the Fourth Proportional to 32.82, 45.31 and 20.55

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Solution

The fourth proportional to 32.82, 45.31 and 20.55 is: 28.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    32.82 : 45.31 = 20.55 : x
  2. Step 2: Convert to fraction form
    32.82/45.31 = 20.55/x
  3. Step 3: Cross multiply
    32.82x = 45.31 × 20.55
  4. Step 4: Simplify right side
    32.82x = 931.12
  5. Step 5: Solve for x
    x = 931.12/32.82
  6. Step 6: Final answer
    x = 28.37

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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.