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Finding the Fourth Proportional to 18,855.24, 28,268.28 and 12,615

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Solution

The fourth proportional to 18,855.24, 28,268.28 and 12,615 is: 18,912.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,855.24 : 28,268.28 = 12,615 : x
  2. Step 2: Convert to fraction form
    18,855.24/28,268.28 = 12,615/x
  3. Step 3: Cross multiply
    18,855.24x = 28,268.28 × 12,615
  4. Step 4: Simplify right side
    18,855.24x = 356,604,352.20
  5. Step 5: Solve for x
    x = 356,604,352.20/18,855.24
  6. Step 6: Final answer
    x = 18,912.75

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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.