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Finding the Fourth Proportional to 18,791.30, 28,185.95 and 6,311.57

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Solution

The fourth proportional to 18,791.30, 28,185.95 and 6,311.57 is: 9,467.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,791.30 : 28,185.95 = 6,311.57 : x
  2. Step 2: Convert to fraction form
    18,791.30/28,185.95 = 6,311.57/x
  3. Step 3: Cross multiply
    18,791.30x = 28,185.95 × 6,311.57
  4. Step 4: Simplify right side
    18,791.30x = 177,897,596.44
  5. Step 5: Solve for x
    x = 177,897,596.44/18,791.30
  6. Step 6: Final answer
    x = 9,467.02

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1.5x scale

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.