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Finding the Fourth Proportional to 18,791.15, 28,189.04 and 6,140.61

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Solution

The fourth proportional to 18,791.15, 28,189.04 and 6,140.61 is: 9,211.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,791.15 : 28,189.04 = 6,140.61 : x
  2. Step 2: Convert to fraction form
    18,791.15/28,189.04 = 6,140.61/x
  3. Step 3: Cross multiply
    18,791.15x = 28,189.04 × 6,140.61
  4. Step 4: Simplify right side
    18,791.15x = 173,097,900.91
  5. Step 5: Solve for x
    x = 173,097,900.91/18,791.15
  6. Step 6: Final answer
    x = 9,211.67

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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.