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Finding the Fourth Proportional to 27.89, 41.76 and 21.11

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Solution

The fourth proportional to 27.89, 41.76 and 21.11 is: 31.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.89 : 41.76 = 21.11 : x
  2. Step 2: Convert to fraction form
    27.89/41.76 = 21.11/x
  3. Step 3: Cross multiply
    27.89x = 41.76 × 21.11
  4. Step 4: Simplify right side
    27.89x = 881.24
  5. Step 5: Solve for x
    x = 881.24/27.89
  6. Step 6: Final answer
    x = 31.60

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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.