Home / 264.28-396.34-81.72

Finding the Fourth Proportional to 264.28, 396.34 and 81.72

Calculator

Solution

The fourth proportional to 264.28, 396.34 and 81.72 is: 122.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    264.28 : 396.34 = 81.72 : x
  2. Step 2: Convert to fraction form
    264.28/396.34 = 81.72/x
  3. Step 3: Cross multiply
    264.28x = 396.34 × 81.72
  4. Step 4: Simplify right side
    264.28x = 32,388.90
  5. Step 5: Solve for x
    x = 32,388.90/264.28
  6. Step 6: Final answer
    x = 122.56

Related Problems

Find fourth proportional to 132.14, 198.17 and 40.86
Half scale
Find fourth proportional to 528.56, 792.68 and 163.44
Double scale
Find fourth proportional to 265.28, 397.84 and 82.72
Similar ratio
Find fourth proportional to 396.42, 594.51 and 122.58
1.5x scale

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.