Home / 434.27-648.69-311.56

Finding the Fourth Proportional to 434.27, 648.69 and 311.56

Calculator

Solution

The fourth proportional to 434.27, 648.69 and 311.56 is: 465.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    434.27 : 648.69 = 311.56 : x
  2. Step 2: Convert to fraction form
    434.27/648.69 = 311.56/x
  3. Step 3: Cross multiply
    434.27x = 648.69 × 311.56
  4. Step 4: Simplify right side
    434.27x = 202,105.86
  5. Step 5: Solve for x
    x = 202,105.86/434.27
  6. Step 6: Final answer
    x = 465.39

Related Problems

Find fourth proportional to 217.14, 324.35 and 155.78
Half scale
Find fourth proportional to 868.54, 1,297.38 and 623.12
Double scale
Find fourth proportional to 435.27, 650.18 and 312.56
Similar ratio
Find fourth proportional to 651.41, 973.04 and 467.34
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.