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Finding the Fourth Proportional to 18,819.83, 28,229.75 and 8,424.29

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Solution

The fourth proportional to 18,819.83, 28,229.75 and 8,424.29 is: 12,636.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,819.83 : 28,229.75 = 8,424.29 : x
  2. Step 2: Convert to fraction form
    18,819.83/28,229.75 = 8,424.29/x
  3. Step 3: Cross multiply
    18,819.83x = 28,229.75 × 8,424.29
  4. Step 4: Simplify right side
    18,819.83x = 237,815,417.36
  5. Step 5: Solve for x
    x = 237,815,417.36/18,819.83
  6. Step 6: Final answer
    x = 12,636.43

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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.