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Finding the Fourth Proportional to 18,949.21, 28,411.66 and 7,863.55

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Solution

The fourth proportional to 18,949.21, 28,411.66 and 7,863.55 is: 11,790.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,949.21 : 28,411.66 = 7,863.55 : x
  2. Step 2: Convert to fraction form
    18,949.21/28,411.66 = 7,863.55/x
  3. Step 3: Cross multiply
    18,949.21x = 28,411.66 × 7,863.55
  4. Step 4: Simplify right side
    18,949.21x = 223,416,508.99
  5. Step 5: Solve for x
    x = 223,416,508.99/18,949.21
  6. Step 6: Final answer
    x = 11,790.28

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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.