Home / 138.85-191.60-76.67

Finding the Fourth Proportional to 138.85, 191.60 and 76.67

Calculator

Solution

The fourth proportional to 138.85, 191.60 and 76.67 is: 105.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.85 : 191.60 = 76.67 : x
  2. Step 2: Convert to fraction form
    138.85/191.60 = 76.67/x
  3. Step 3: Cross multiply
    138.85x = 191.60 × 76.67
  4. Step 4: Simplify right side
    138.85x = 14,689.97
  5. Step 5: Solve for x
    x = 14,689.97/138.85
  6. Step 6: Final answer
    x = 105.80

Related Problems

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.