Home / 413.72-620.50-243.80

Finding the Fourth Proportional to 413.72, 620.50 and 243.80

Calculator

Solution

The fourth proportional to 413.72, 620.50 and 243.80 is: 365.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.72 : 620.50 = 243.80 : x
  2. Step 2: Convert to fraction form
    413.72/620.50 = 243.80/x
  3. Step 3: Cross multiply
    413.72x = 620.50 × 243.80
  4. Step 4: Simplify right side
    413.72x = 151,277.90
  5. Step 5: Solve for x
    x = 151,277.90/413.72
  6. Step 6: Final answer
    x = 365.65

Related Problems

Find fourth proportional to 206.86, 310.25 and 121.90
Half scale
Find fourth proportional to 827.44, 1,241 and 487.60
Double scale
Find fourth proportional to 414.72, 622 and 244.80
Similar ratio
Find fourth proportional to 620.58, 930.75 and 365.70
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.