Home / 432-648-426.60

Finding the Fourth Proportional to 432, 648 and 426.60

Calculator

Solution

The fourth proportional to 432, 648 and 426.60 is: 639.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    432 : 648 = 426.60 : x
  2. Step 2: Convert to fraction form
    432/648 = 426.60/x
  3. Step 3: Cross multiply
    432x = 648 × 426.60
  4. Step 4: Simplify right side
    432x = 276,436.80
  5. Step 5: Solve for x
    x = 276,436.80/432
  6. Step 6: Final answer
    x = 639.90

Related Problems

Find fourth proportional to 216, 324 and 213.30
Half scale
Find fourth proportional to 864, 1,296 and 853.20
Double scale
Find fourth proportional to 433, 649.50 and 427.60
Similar ratio
Find fourth proportional to 648, 972 and 639.90
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.