Home / 80.78-121.16-32.72

Finding the Fourth Proportional to 80.78, 121.16 and 32.72

Calculator

Solution

The fourth proportional to 80.78, 121.16 and 32.72 is: 49.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.78 : 121.16 = 32.72 : x
  2. Step 2: Convert to fraction form
    80.78/121.16 = 32.72/x
  3. Step 3: Cross multiply
    80.78x = 121.16 × 32.72
  4. Step 4: Simplify right side
    80.78x = 3,964.36
  5. Step 5: Solve for x
    x = 3,964.36/80.78
  6. Step 6: Final answer
    x = 49.08

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.