Home / 331.28-456-306.98

Finding the Fourth Proportional to 331.28, 456 and 306.98

Calculator

Solution

The fourth proportional to 331.28, 456 and 306.98 is: 422.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.28 : 456 = 306.98 : x
  2. Step 2: Convert to fraction form
    331.28/456 = 306.98/x
  3. Step 3: Cross multiply
    331.28x = 456 × 306.98
  4. Step 4: Simplify right side
    331.28x = 139,982.88
  5. Step 5: Solve for x
    x = 139,982.88/331.28
  6. Step 6: Final answer
    x = 422.55

Related Problems

Find fourth proportional to 165.64, 228 and 153.49
Half scale
Find fourth proportional to 662.56, 912 and 613.96
Double scale
Find fourth proportional to 332.28, 457.38 and 307.98
Similar ratio
Find fourth proportional to 496.92, 684 and 460.47
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.