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Finding the Fourth Proportional to 27.61, 41.31 and 20.84

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Solution

The fourth proportional to 27.61, 41.31 and 20.84 is: 31.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.61 : 41.31 = 20.84 : x
  2. Step 2: Convert to fraction form
    27.61/41.31 = 20.84/x
  3. Step 3: Cross multiply
    27.61x = 41.31 × 20.84
  4. Step 4: Simplify right side
    27.61x = 860.69
  5. Step 5: Solve for x
    x = 860.69/27.61
  6. Step 6: Final answer
    x = 31.18

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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.