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Finding the Fourth Proportional to 18,949.15, 28,411.57 and 7,863.49

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Solution

The fourth proportional to 18,949.15, 28,411.57 and 7,863.49 is: 11,790.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,949.15 : 28,411.57 = 7,863.49 : x
  2. Step 2: Convert to fraction form
    18,949.15/28,411.57 = 7,863.49/x
  3. Step 3: Cross multiply
    18,949.15x = 28,411.57 × 7,863.49
  4. Step 4: Simplify right side
    18,949.15x = 223,414,005.89
  5. Step 5: Solve for x
    x = 223,414,005.89/18,949.15
  6. Step 6: Final answer
    x = 11,790.19

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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.