Home / 13.87-20.80-5.86

Finding the Fourth Proportional to 13.87, 20.80 and 5.86

Calculator

Solution

The fourth proportional to 13.87, 20.80 and 5.86 is: 8.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.87 : 20.80 = 5.86 : x
  2. Step 2: Convert to fraction form
    13.87/20.80 = 5.86/x
  3. Step 3: Cross multiply
    13.87x = 20.80 × 5.86
  4. Step 4: Simplify right side
    13.87x = 121.78
  5. Step 5: Solve for x
    x = 121.78/13.87
  6. Step 6: Final answer
    x = 8.78

Related Problems

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.