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Finding the Fourth Proportional to 18,757.23, 28,143.62 and 8,221.80

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Solution

The fourth proportional to 18,757.23, 28,143.62 and 8,221.80 is: 12,336.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,757.23 : 28,143.62 = 8,221.80 : x
  2. Step 2: Convert to fraction form
    18,757.23/28,143.62 = 8,221.80/x
  3. Step 3: Cross multiply
    18,757.23x = 28,143.62 × 8,221.80
  4. Step 4: Simplify right side
    18,757.23x = 231,391,214.92
  5. Step 5: Solve for x
    x = 231,391,214.92/18,757.23
  6. Step 6: Final answer
    x = 12,336.11

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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.