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Finding the Fourth Proportional to 18,793.80, 28,187.65 and 5,643.86

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Solution

The fourth proportional to 18,793.80, 28,187.65 and 5,643.86 is: 8,464.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,793.80 : 28,187.65 = 5,643.86 : x
  2. Step 2: Convert to fraction form
    18,793.80/28,187.65 = 5,643.86/x
  3. Step 3: Cross multiply
    18,793.80x = 28,187.65 × 5,643.86
  4. Step 4: Simplify right side
    18,793.80x = 159,087,150.33
  5. Step 5: Solve for x
    x = 159,087,150.33/18,793.80
  6. Step 6: Final answer
    x = 8,464.87

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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.