Home / 444.30-666.71-320.78

Finding the Fourth Proportional to 444.30, 666.71 and 320.78

Calculator

Solution

The fourth proportional to 444.30, 666.71 and 320.78 is: 481.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    444.30 : 666.71 = 320.78 : x
  2. Step 2: Convert to fraction form
    444.30/666.71 = 320.78/x
  3. Step 3: Cross multiply
    444.30x = 666.71 × 320.78
  4. Step 4: Simplify right side
    444.30x = 213,862.30
  5. Step 5: Solve for x
    x = 213,862.30/444.30
  6. Step 6: Final answer
    x = 481.35

Related Problems

Find fourth proportional to 222.15, 333.35 and 160.39
Half scale
Find fourth proportional to 888.60, 1,333.41 and 641.55
Double scale
Find fourth proportional to 445.30, 668.21 and 321.78
Similar ratio
Find fourth proportional to 666.45, 1,000.06 and 481.16
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.