Home / 330.78-456.27-212.90

Finding the Fourth Proportional to 330.78, 456.27 and 212.90

Calculator

Solution

The fourth proportional to 330.78, 456.27 and 212.90 is: 293.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.78 : 456.27 = 212.90 : x
  2. Step 2: Convert to fraction form
    330.78/456.27 = 212.90/x
  3. Step 3: Cross multiply
    330.78x = 456.27 × 212.90
  4. Step 4: Simplify right side
    330.78x = 97,141.08
  5. Step 5: Solve for x
    x = 97,141.08/330.78
  6. Step 6: Final answer
    x = 293.67

Related Problems

Find fourth proportional to 165.39, 228.13 and 106.45
Half scale
Find fourth proportional to 661.56, 912.53 and 425.81
Double scale
Find fourth proportional to 331.78, 457.65 and 213.90
Similar ratio
Find fourth proportional to 496.17, 684.40 and 319.36
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.