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Finding the Fourth Proportional to 30.05, 41.45 and 18.39

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Solution

The fourth proportional to 30.05, 41.45 and 18.39 is: 25.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.05 : 41.45 = 18.39 : x
  2. Step 2: Convert to fraction form
    30.05/41.45 = 18.39/x
  3. Step 3: Cross multiply
    30.05x = 41.45 × 18.39
  4. Step 4: Simplify right side
    30.05x = 762.27
  5. Step 5: Solve for x
    x = 762.27/30.05
  6. Step 6: Final answer
    x = 25.37

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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.