Home / 242.56-363.99-139.78

Finding the Fourth Proportional to 242.56, 363.99 and 139.78

Calculator

Solution

The fourth proportional to 242.56, 363.99 and 139.78 is: 209.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.56 : 363.99 = 139.78 : x
  2. Step 2: Convert to fraction form
    242.56/363.99 = 139.78/x
  3. Step 3: Cross multiply
    242.56x = 363.99 × 139.78
  4. Step 4: Simplify right side
    242.56x = 50,876.70
  5. Step 5: Solve for x
    x = 50,876.70/242.56
  6. Step 6: Final answer
    x = 209.75

Related Problems

Find fourth proportional to 121.28, 182.00 and 69.89
Half scale
Find fourth proportional to 485.11, 727.98 and 279.55
Double scale
Find fourth proportional to 243.56, 365.49 and 140.78
Similar ratio
Find fourth proportional to 363.83, 545.99 and 209.66
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.