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Finding the Fourth Proportional to 18,758.91, 28,131.51 and 8,221.68

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Solution

The fourth proportional to 18,758.91, 28,131.51 and 8,221.68 is: 12,329.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,758.91 : 28,131.51 = 8,221.68 : x
  2. Step 2: Convert to fraction form
    18,758.91/28,131.51 = 8,221.68/x
  3. Step 3: Cross multiply
    18,758.91x = 28,131.51 × 8,221.68
  4. Step 4: Simplify right side
    18,758.91x = 231,288,273.14
  5. Step 5: Solve for x
    x = 231,288,273.14/18,758.91
  6. Step 6: Final answer
    x = 12,329.52

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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.