Home / 13,431.23-20,138.99-5,111.87

Finding the Fourth Proportional to 13,431.23, 20,138.99 and 5,111.87

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Solution

The fourth proportional to 13,431.23, 20,138.99 and 5,111.87 is: 7,664.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,431.23 : 20,138.99 = 5,111.87 : x
  2. Step 2: Convert to fraction form
    13,431.23/20,138.99 = 5,111.87/x
  3. Step 3: Cross multiply
    13,431.23x = 20,138.99 × 5,111.87
  4. Step 4: Simplify right side
    13,431.23x = 102,947,772.56
  5. Step 5: Solve for x
    x = 102,947,772.56/13,431.23
  6. Step 6: Final answer
    x = 7,664.80

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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.