Home / 480-662.40-305.31

Finding the Fourth Proportional to 480, 662.40 and 305.31

Calculator

Solution

The fourth proportional to 480, 662.40 and 305.31 is: 421.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    480 : 662.40 = 305.31 : x
  2. Step 2: Convert to fraction form
    480/662.40 = 305.31/x
  3. Step 3: Cross multiply
    480x = 662.40 × 305.31
  4. Step 4: Simplify right side
    480x = 202,237.34
  5. Step 5: Solve for x
    x = 202,237.34/480
  6. Step 6: Final answer
    x = 421.33

Related Problems

Find fourth proportional to 240, 331.20 and 152.66
Half scale
Find fourth proportional to 960, 1,324.80 and 610.62
Double scale
Find fourth proportional to 481, 663.78 and 306.31
Similar ratio
Find fourth proportional to 720, 993.60 and 457.97
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.