Home / 480.86-721.43-275.80

Finding the Fourth Proportional to 480.86, 721.43 and 275.80

Calculator

Solution

The fourth proportional to 480.86, 721.43 and 275.80 is: 413.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.86 : 721.43 = 275.80 : x
  2. Step 2: Convert to fraction form
    480.86/721.43 = 275.80/x
  3. Step 3: Cross multiply
    480.86x = 721.43 × 275.80
  4. Step 4: Simplify right side
    480.86x = 198,970.39
  5. Step 5: Solve for x
    x = 198,970.39/480.86
  6. Step 6: Final answer
    x = 413.78

Related Problems

Find fourth proportional to 240.43, 360.72 and 137.90
Half scale
Find fourth proportional to 961.72, 1,442.86 and 551.60
Double scale
Find fourth proportional to 481.86, 722.93 and 276.80
Similar ratio
Find fourth proportional to 721.29, 1,082.15 and 413.70
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.