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Finding the Fourth Proportional to 38.21, 52.70 and 30.05

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Solution

The fourth proportional to 38.21, 52.70 and 30.05 is: 41.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.21 : 52.70 = 30.05 : x
  2. Step 2: Convert to fraction form
    38.21/52.70 = 30.05/x
  3. Step 3: Cross multiply
    38.21x = 52.70 × 30.05
  4. Step 4: Simplify right side
    38.21x = 1,583.45
  5. Step 5: Solve for x
    x = 1,583.45/38.21
  6. Step 6: Final answer
    x = 41.44

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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.