Home / 481.08-720.18-309.72

Finding the Fourth Proportional to 481.08, 720.18 and 309.72

Calculator

Solution

The fourth proportional to 481.08, 720.18 and 309.72 is: 463.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.08 : 720.18 = 309.72 : x
  2. Step 2: Convert to fraction form
    481.08/720.18 = 309.72/x
  3. Step 3: Cross multiply
    481.08x = 720.18 × 309.72
  4. Step 4: Simplify right side
    481.08x = 223,054.15
  5. Step 5: Solve for x
    x = 223,054.15/481.08
  6. Step 6: Final answer
    x = 463.65

Related Problems

Find fourth proportional to 240.54, 360.09 and 154.86
Half scale
Find fourth proportional to 962.16, 1,440.36 and 619.44
Double scale
Find fourth proportional to 482.08, 721.68 and 310.72
Similar ratio
Find fourth proportional to 721.62, 1,080.27 and 464.58
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.