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Finding the Fourth Proportional to 41.14, 61.71 and 19.78

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Solution

The fourth proportional to 41.14, 61.71 and 19.78 is: 29.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    41.14 : 61.71 = 19.78 : x
  2. Step 2: Convert to fraction form
    41.14/61.71 = 19.78/x
  3. Step 3: Cross multiply
    41.14x = 61.71 × 19.78
  4. Step 4: Simplify right side
    41.14x = 1,220.62
  5. Step 5: Solve for x
    x = 1,220.62/41.14
  6. Step 6: Final answer
    x = 29.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.