Home / 105.40-157.65-80.76

Finding the Fourth Proportional to 105.40, 157.65 and 80.76

Calculator

Solution

The fourth proportional to 105.40, 157.65 and 80.76 is: 120.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.40 : 157.65 = 80.76 : x
  2. Step 2: Convert to fraction form
    105.40/157.65 = 80.76/x
  3. Step 3: Cross multiply
    105.40x = 157.65 × 80.76
  4. Step 4: Simplify right side
    105.40x = 12,731.81
  5. Step 5: Solve for x
    x = 12,731.81/105.40
  6. Step 6: Final answer
    x = 120.80

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.