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Finding the Fourth Proportional to 18,800.76, 28,162.20 and 8,419.80

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Solution

The fourth proportional to 18,800.76, 28,162.20 and 8,419.80 is: 12,612.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,800.76 : 28,162.20 = 8,419.80 : x
  2. Step 2: Convert to fraction form
    18,800.76/28,162.20 = 8,419.80/x
  3. Step 3: Cross multiply
    18,800.76x = 28,162.20 × 8,419.80
  4. Step 4: Simplify right side
    18,800.76x = 237,120,091.56
  5. Step 5: Solve for x
    x = 237,120,091.56/18,800.76
  6. Step 6: Final answer
    x = 12,612.26

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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.