Home / 13,419.86-20,129.79-3,559.91

Finding the Fourth Proportional to 13,419.86, 20,129.79 and 3,559.91

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Solution

The fourth proportional to 13,419.86, 20,129.79 and 3,559.91 is: 5,339.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,419.86 : 20,129.79 = 3,559.91 : x
  2. Step 2: Convert to fraction form
    13,419.86/20,129.79 = 3,559.91/x
  3. Step 3: Cross multiply
    13,419.86x = 20,129.79 × 3,559.91
  4. Step 4: Simplify right side
    13,419.86x = 71,660,240.72
  5. Step 5: Solve for x
    x = 71,660,240.72/13,419.86
  6. Step 6: Final answer
    x = 5,339.87

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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.