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Finding the Fourth Proportional to 18,819.68, 28,240.46 and 8,431.43

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Solution

The fourth proportional to 18,819.68, 28,240.46 and 8,431.43 is: 12,652.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,819.68 : 28,240.46 = 8,431.43 : x
  2. Step 2: Convert to fraction form
    18,819.68/28,240.46 = 8,431.43/x
  3. Step 3: Cross multiply
    18,819.68x = 28,240.46 × 8,431.43
  4. Step 4: Simplify right side
    18,819.68x = 238,107,452.96
  5. Step 5: Solve for x
    x = 238,107,452.96/18,819.68
  6. Step 6: Final answer
    x = 12,652.05

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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.