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Finding the Fourth Proportional to 18,668.86, 28,008.49 and 8,139.80

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Solution

The fourth proportional to 18,668.86, 28,008.49 and 8,139.80 is: 12,211.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,668.86 : 28,008.49 = 8,139.80 : x
  2. Step 2: Convert to fraction form
    18,668.86/28,008.49 = 8,139.80/x
  3. Step 3: Cross multiply
    18,668.86x = 28,008.49 × 8,139.80
  4. Step 4: Simplify right side
    18,668.86x = 227,983,606.91
  5. Step 5: Solve for x
    x = 227,983,606.91/18,668.86
  6. Step 6: Final answer
    x = 12,211.97

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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.