Home / 272.85-409.26-90.21

Finding the Fourth Proportional to 272.85, 409.26 and 90.21

Calculator

Solution

The fourth proportional to 272.85, 409.26 and 90.21 is: 135.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.85 : 409.26 = 90.21 : x
  2. Step 2: Convert to fraction form
    272.85/409.26 = 90.21/x
  3. Step 3: Cross multiply
    272.85x = 409.26 × 90.21
  4. Step 4: Simplify right side
    272.85x = 36,919.34
  5. Step 5: Solve for x
    x = 36,919.34/272.85
  6. Step 6: Final answer
    x = 135.31

Related Problems

Find fourth proportional to 136.43, 204.63 and 45.11
Half scale
Find fourth proportional to 545.70, 818.52 and 180.42
Double scale
Find fourth proportional to 273.85, 410.76 and 91.21
Similar ratio
Find fourth proportional to 409.28, 613.89 and 135.32
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.