Home / 382.21-572.79-208.42

Finding the Fourth Proportional to 382.21, 572.79 and 208.42

Calculator

Solution

The fourth proportional to 382.21, 572.79 and 208.42 is: 312.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.21 : 572.79 = 208.42 : x
  2. Step 2: Convert to fraction form
    382.21/572.79 = 208.42/x
  3. Step 3: Cross multiply
    382.21x = 572.79 × 208.42
  4. Step 4: Simplify right side
    382.21x = 119,380.89
  5. Step 5: Solve for x
    x = 119,380.89/382.21
  6. Step 6: Final answer
    x = 312.34

Related Problems

Find fourth proportional to 191.11, 286.40 and 104.21
Half scale
Find fourth proportional to 764.42, 1,145.58 and 416.84
Double scale
Find fourth proportional to 383.21, 574.29 and 209.42
Similar ratio
Find fourth proportional to 573.32, 859.19 and 312.63
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.