Home / 382.71-573.81-139.21

Finding the Fourth Proportional to 382.71, 573.81 and 139.21

Calculator

Solution

The fourth proportional to 382.71, 573.81 and 139.21 is: 208.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.71 : 573.81 = 139.21 : x
  2. Step 2: Convert to fraction form
    382.71/573.81 = 139.21/x
  3. Step 3: Cross multiply
    382.71x = 573.81 × 139.21
  4. Step 4: Simplify right side
    382.71x = 79,877.22
  5. Step 5: Solve for x
    x = 79,877.22/382.71
  6. Step 6: Final answer
    x = 208.71

Related Problems

Find fourth proportional to 191.36, 286.91 and 69.60
Half scale
Find fourth proportional to 765.42, 1,147.62 and 278.41
Double scale
Find fourth proportional to 383.71, 575.31 and 140.21
Similar ratio
Find fourth proportional to 574.07, 860.72 and 208.81
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.