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Finding the Fourth Proportional to 18,757.40, 28,143.86 and 8,221.95

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Solution

The fourth proportional to 18,757.40, 28,143.86 and 8,221.95 is: 12,336.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,757.40 : 28,143.86 = 8,221.95 : x
  2. Step 2: Convert to fraction form
    18,757.40/28,143.86 = 8,221.95/x
  3. Step 3: Cross multiply
    18,757.40x = 28,143.86 × 8,221.95
  4. Step 4: Simplify right side
    18,757.40x = 231,397,368.62
  5. Step 5: Solve for x
    x = 231,397,368.62/18,757.40
  6. Step 6: Final answer
    x = 12,336.33

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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.