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Finding the Fourth Proportional to 18,959.63, 28,439.44 and 5,811.91

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Solution

The fourth proportional to 18,959.63, 28,439.44 and 5,811.91 is: 8,717.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,959.63 : 28,439.44 = 5,811.91 : x
  2. Step 2: Convert to fraction form
    18,959.63/28,439.44 = 5,811.91/x
  3. Step 3: Cross multiply
    18,959.63x = 28,439.44 × 5,811.91
  4. Step 4: Simplify right side
    18,959.63x = 165,287,380.10
  5. Step 5: Solve for x
    x = 165,287,380.10/18,959.63
  6. Step 6: Final answer
    x = 8,717.86

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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.