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Finding the Fourth Proportional to 18,791.78, 28,186.67 and 6,311.90

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Solution

The fourth proportional to 18,791.78, 28,186.67 and 6,311.90 is: 9,467.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,791.78 : 28,186.67 = 6,311.90 : x
  2. Step 2: Convert to fraction form
    18,791.78/28,186.67 = 6,311.90/x
  3. Step 3: Cross multiply
    18,791.78x = 28,186.67 × 6,311.90
  4. Step 4: Simplify right side
    18,791.78x = 177,911,269.88
  5. Step 5: Solve for x
    x = 177,911,269.88/18,791.78
  6. Step 6: Final answer
    x = 9,467.51

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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.