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Finding the Fourth Proportional to 20,490.76, 30,745.86 and 12,187.15

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Solution

The fourth proportional to 20,490.76, 30,745.86 and 12,187.15 is: 18,286.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,490.76 : 30,745.86 = 12,187.15 : x
  2. Step 2: Convert to fraction form
    20,490.76/30,745.86 = 12,187.15/x
  3. Step 3: Cross multiply
    20,490.76x = 30,745.86 × 12,187.15
  4. Step 4: Simplify right side
    20,490.76x = 374,704,407.70
  5. Step 5: Solve for x
    x = 374,704,407.70/20,490.76
  6. Step 6: Final answer
    x = 18,286.51

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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.