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Finding the Fourth Proportional to 18,819.29, 28,239.87 and 8,431.04

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Solution

The fourth proportional to 18,819.29, 28,239.87 and 8,431.04 is: 12,651.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,819.29 : 28,239.87 = 8,431.04 : x
  2. Step 2: Convert to fraction form
    18,819.29/28,239.87 = 8,431.04/x
  3. Step 3: Cross multiply
    18,819.29x = 28,239.87 × 8,431.04
  4. Step 4: Simplify right side
    18,819.29x = 238,091,473.56
  5. Step 5: Solve for x
    x = 238,091,473.56/18,819.29
  6. Step 6: Final answer
    x = 12,651.46

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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.