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Finding the Fourth Proportional to 18,891.69, 28,341.64 and 5,743.72

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Solution

The fourth proportional to 18,891.69, 28,341.64 and 5,743.72 is: 8,616.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,891.69 : 28,341.64 = 5,743.72 : x
  2. Step 2: Convert to fraction form
    18,891.69/28,341.64 = 5,743.72/x
  3. Step 3: Cross multiply
    18,891.69x = 28,341.64 × 5,743.72
  4. Step 4: Simplify right side
    18,891.69x = 162,786,522.92
  5. Step 5: Solve for x
    x = 162,786,522.92/18,891.69
  6. Step 6: Final answer
    x = 8,616.83

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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.