Home / 242.70-363.90-145.20

Finding the Fourth Proportional to 242.70, 363.90 and 145.20

Calculator

Solution

The fourth proportional to 242.70, 363.90 and 145.20 is: 217.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.70 : 363.90 = 145.20 : x
  2. Step 2: Convert to fraction form
    242.70/363.90 = 145.20/x
  3. Step 3: Cross multiply
    242.70x = 363.90 × 145.20
  4. Step 4: Simplify right side
    242.70x = 52,838.28
  5. Step 5: Solve for x
    x = 52,838.28/242.70
  6. Step 6: Final answer
    x = 217.71

Related Problems

Find fourth proportional to 121.35, 181.95 and 72.60
Half scale
Find fourth proportional to 485.40, 727.80 and 290.40
Double scale
Find fourth proportional to 243.70, 365.40 and 146.20
Similar ratio
Find fourth proportional to 364.05, 545.85 and 217.80
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.