Home / 112.15-167.85-81.22

Finding the Fourth Proportional to 112.15, 167.85 and 81.22

Calculator

Solution

The fourth proportional to 112.15, 167.85 and 81.22 is: 121.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.15 : 167.85 = 81.22 : x
  2. Step 2: Convert to fraction form
    112.15/167.85 = 81.22/x
  3. Step 3: Cross multiply
    112.15x = 167.85 × 81.22
  4. Step 4: Simplify right side
    112.15x = 13,632.78
  5. Step 5: Solve for x
    x = 13,632.78/112.15
  6. Step 6: Final answer
    x = 121.56

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.