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Finding the Fourth Proportional to 18,789.54, 28,189.80 and 8,398.86

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Solution

The fourth proportional to 18,789.54, 28,189.80 and 8,398.86 is: 12,600.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,789.54 : 28,189.80 = 8,398.86 : x
  2. Step 2: Convert to fraction form
    18,789.54/28,189.80 = 8,398.86/x
  3. Step 3: Cross multiply
    18,789.54x = 28,189.80 × 8,398.86
  4. Step 4: Simplify right side
    18,789.54x = 236,762,183.63
  5. Step 5: Solve for x
    x = 236,762,183.63/18,789.54
  6. Step 6: Final answer
    x = 12,600.74

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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.