Home / 13,431.80-20,142.92-5,109.60

Finding the Fourth Proportional to 13,431.80, 20,142.92 and 5,109.60

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Solution

The fourth proportional to 13,431.80, 20,142.92 and 5,109.60 is: 7,662.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,431.80 : 20,142.92 = 5,109.60 : x
  2. Step 2: Convert to fraction form
    13,431.80/20,142.92 = 5,109.60/x
  3. Step 3: Cross multiply
    13,431.80x = 20,142.92 × 5,109.60
  4. Step 4: Simplify right side
    13,431.80x = 102,922,264.03
  5. Step 5: Solve for x
    x = 102,922,264.03/13,431.80
  6. Step 6: Final answer
    x = 7,662.58

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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.