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Finding the Fourth Proportional to 27.37, 37.78 and 21.90

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Solution

The fourth proportional to 27.37, 37.78 and 21.90 is: 30.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.37 : 37.78 = 21.90 : x
  2. Step 2: Convert to fraction form
    27.37/37.78 = 21.90/x
  3. Step 3: Cross multiply
    27.37x = 37.78 × 21.90
  4. Step 4: Simplify right side
    27.37x = 827.38
  5. Step 5: Solve for x
    x = 827.38/27.37
  6. Step 6: Final answer
    x = 30.23

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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.