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Finding the Fourth Proportional to 27.72, 38.43 and 26.78

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Solution

The fourth proportional to 27.72, 38.43 and 26.78 is: 37.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.72 : 38.43 = 26.78 : x
  2. Step 2: Convert to fraction form
    27.72/38.43 = 26.78/x
  3. Step 3: Cross multiply
    27.72x = 38.43 × 26.78
  4. Step 4: Simplify right side
    27.72x = 1,029.07
  5. Step 5: Solve for x
    x = 1,029.07/27.72
  6. Step 6: Final answer
    x = 37.12

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.