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Finding the Fourth Proportional to 34.39, 51.78 and 27.21

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Solution

The fourth proportional to 34.39, 51.78 and 27.21 is: 40.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.39 : 51.78 = 27.21 : x
  2. Step 2: Convert to fraction form
    34.39/51.78 = 27.21/x
  3. Step 3: Cross multiply
    34.39x = 51.78 × 27.21
  4. Step 4: Simplify right side
    34.39x = 1,408.93
  5. Step 5: Solve for x
    x = 1,408.93/34.39
  6. Step 6: Final answer
    x = 40.97

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.