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Finding the Fourth Proportional to 27.28, 40.90 and 20.56

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Solution

The fourth proportional to 27.28, 40.90 and 20.56 is: 30.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.28 : 40.90 = 20.56 : x
  2. Step 2: Convert to fraction form
    27.28/40.90 = 20.56/x
  3. Step 3: Cross multiply
    27.28x = 40.90 × 20.56
  4. Step 4: Simplify right side
    27.28x = 840.90
  5. Step 5: Solve for x
    x = 840.90/27.28
  6. Step 6: Final answer
    x = 30.82

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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.