Home / 394-543.68-228.20

Finding the Fourth Proportional to 394, 543.68 and 228.20

Calculator

Solution

The fourth proportional to 394, 543.68 and 228.20 is: 314.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    394 : 543.68 = 228.20 : x
  2. Step 2: Convert to fraction form
    394/543.68 = 228.20/x
  3. Step 3: Cross multiply
    394x = 543.68 × 228.20
  4. Step 4: Simplify right side
    394x = 124,067.78
  5. Step 5: Solve for x
    x = 124,067.78/394
  6. Step 6: Final answer
    x = 314.89

Related Problems

Find fourth proportional to 197, 271.84 and 114.10
Half scale
Find fourth proportional to 788, 1,087.36 and 456.40
Double scale
Find fourth proportional to 395, 545.06 and 229.20
Similar ratio
Find fourth proportional to 591, 815.52 and 342.30
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.