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Finding the Fourth Proportional to 55.26, 82.92 and 20.56

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Solution

The fourth proportional to 55.26, 82.92 and 20.56 is: 30.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.26 : 82.92 = 20.56 : x
  2. Step 2: Convert to fraction form
    55.26/82.92 = 20.56/x
  3. Step 3: Cross multiply
    55.26x = 82.92 × 20.56
  4. Step 4: Simplify right side
    55.26x = 1,704.38
  5. Step 5: Solve for x
    x = 1,704.38/55.26
  6. Step 6: Final answer
    x = 30.84

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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.