Home / 372.80-559.20-219.80

Finding the Fourth Proportional to 372.80, 559.20 and 219.80

Calculator

Solution

The fourth proportional to 372.80, 559.20 and 219.80 is: 329.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.80 : 559.20 = 219.80 : x
  2. Step 2: Convert to fraction form
    372.80/559.20 = 219.80/x
  3. Step 3: Cross multiply
    372.80x = 559.20 × 219.80
  4. Step 4: Simplify right side
    372.80x = 122,909.36
  5. Step 5: Solve for x
    x = 122,909.36/372.80
  6. Step 6: Final answer
    x = 329.70

Related Problems

Find fourth proportional to 186.40, 279.60 and 109.90
Half scale
Find fourth proportional to 745.59, 1,118.40 and 439.59
Double scale
Find fourth proportional to 373.80, 560.70 and 220.80
Similar ratio
Find fourth proportional to 559.19, 838.80 and 329.69
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.