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Finding the Fourth Proportional to 7,813.72, 11,720.52 and 2,619.56

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Solution

The fourth proportional to 7,813.72, 11,720.52 and 2,619.56 is: 3,929.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,813.72 : 11,720.52 = 2,619.56 : x
  2. Step 2: Convert to fraction form
    7,813.72/11,720.52 = 2,619.56/x
  3. Step 3: Cross multiply
    7,813.72x = 11,720.52 × 2,619.56
  4. Step 4: Simplify right side
    7,813.72x = 30,702,605.37
  5. Step 5: Solve for x
    x = 30,702,605.37/7,813.72
  6. Step 6: Final answer
    x = 3,929.32

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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.