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Finding the Fourth Proportional to 27.77, 38.31 and 21.98

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Solution

The fourth proportional to 27.77, 38.31 and 21.98 is: 30.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.77 : 38.31 = 21.98 : x
  2. Step 2: Convert to fraction form
    27.77/38.31 = 21.98/x
  3. Step 3: Cross multiply
    27.77x = 38.31 × 21.98
  4. Step 4: Simplify right side
    27.77x = 842.05
  5. Step 5: Solve for x
    x = 842.05/27.77
  6. Step 6: Final answer
    x = 30.32

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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.