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Finding the Fourth Proportional to 18,959.87, 28,447.20 and 7,863.75

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Solution

The fourth proportional to 18,959.87, 28,447.20 and 7,863.75 is: 11,798.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,959.87 : 28,447.20 = 7,863.75 : x
  2. Step 2: Convert to fraction form
    18,959.87/28,447.20 = 7,863.75/x
  3. Step 3: Cross multiply
    18,959.87x = 28,447.20 × 7,863.75
  4. Step 4: Simplify right side
    18,959.87x = 223,701,669
  5. Step 5: Solve for x
    x = 223,701,669/18,959.87
  6. Step 6: Final answer
    x = 11,798.69

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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.