Home / 327.78-491.85-145.30

Finding the Fourth Proportional to 327.78, 491.85 and 145.30

Calculator

Solution

The fourth proportional to 327.78, 491.85 and 145.30 is: 218.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.78 : 491.85 = 145.30 : x
  2. Step 2: Convert to fraction form
    327.78/491.85 = 145.30/x
  3. Step 3: Cross multiply
    327.78x = 491.85 × 145.30
  4. Step 4: Simplify right side
    327.78x = 71,465.81
  5. Step 5: Solve for x
    x = 71,465.81/327.78
  6. Step 6: Final answer
    x = 218.03

Related Problems

Find fourth proportional to 163.89, 245.93 and 72.65
Half scale
Find fourth proportional to 655.56, 983.70 and 290.60
Double scale
Find fourth proportional to 328.78, 493.35 and 146.30
Similar ratio
Find fourth proportional to 491.67, 737.78 and 217.95
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.