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Finding the Fourth Proportional to 34.62, 51.90 and 11.78

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Solution

The fourth proportional to 34.62, 51.90 and 11.78 is: 17.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.62 : 51.90 = 11.78 : x
  2. Step 2: Convert to fraction form
    34.62/51.90 = 11.78/x
  3. Step 3: Cross multiply
    34.62x = 51.90 × 11.78
  4. Step 4: Simplify right side
    34.62x = 611.57
  5. Step 5: Solve for x
    x = 611.57/34.62
  6. Step 6: Final answer
    x = 17.67

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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.