Home / 363.78-545.67-120.30

Finding the Fourth Proportional to 363.78, 545.67 and 120.30

Calculator

Solution

The fourth proportional to 363.78, 545.67 and 120.30 is: 180.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    363.78 : 545.67 = 120.30 : x
  2. Step 2: Convert to fraction form
    363.78/545.67 = 120.30/x
  3. Step 3: Cross multiply
    363.78x = 545.67 × 120.30
  4. Step 4: Simplify right side
    363.78x = 65,644.10
  5. Step 5: Solve for x
    x = 65,644.10/363.78
  6. Step 6: Final answer
    x = 180.45

Related Problems

Find fourth proportional to 181.89, 272.84 and 60.15
Half scale
Find fourth proportional to 727.56, 1,091.34 and 240.60
Double scale
Find fourth proportional to 364.78, 547.17 and 121.30
Similar ratio
Find fourth proportional to 545.67, 818.51 and 180.45
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.