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Finding the Fourth Proportional to 27.74, 38.28 and 20.46

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Solution

The fourth proportional to 27.74, 38.28 and 20.46 is: 28.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.74 : 38.28 = 20.46 : x
  2. Step 2: Convert to fraction form
    27.74/38.28 = 20.46/x
  3. Step 3: Cross multiply
    27.74x = 38.28 × 20.46
  4. Step 4: Simplify right side
    27.74x = 783.21
  5. Step 5: Solve for x
    x = 783.21/27.74
  6. Step 6: Final answer
    x = 28.23

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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.