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Finding the Fourth Proportional to 34.42, 47.27 and 30.78

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Solution

The fourth proportional to 34.42, 47.27 and 30.78 is: 42.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.42 : 47.27 = 30.78 : x
  2. Step 2: Convert to fraction form
    34.42/47.27 = 30.78/x
  3. Step 3: Cross multiply
    34.42x = 47.27 × 30.78
  4. Step 4: Simplify right side
    34.42x = 1,454.97
  5. Step 5: Solve for x
    x = 1,454.97/34.42
  6. Step 6: Final answer
    x = 42.27

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.