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Finding the Fourth Proportional to 27.71, 38.15 and 21.56

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Solution

The fourth proportional to 27.71, 38.15 and 21.56 is: 29.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.71 : 38.15 = 21.56 : x
  2. Step 2: Convert to fraction form
    27.71/38.15 = 21.56/x
  3. Step 3: Cross multiply
    27.71x = 38.15 × 21.56
  4. Step 4: Simplify right side
    27.71x = 822.22
  5. Step 5: Solve for x
    x = 822.22/27.71
  6. Step 6: Final answer
    x = 29.68

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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.