Home / 240.39-331.21-218.55

Finding the Fourth Proportional to 240.39, 331.21 and 218.55

Calculator

Solution

The fourth proportional to 240.39, 331.21 and 218.55 is: 301.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    240.39 : 331.21 = 218.55 : x
  2. Step 2: Convert to fraction form
    240.39/331.21 = 218.55/x
  3. Step 3: Cross multiply
    240.39x = 331.21 × 218.55
  4. Step 4: Simplify right side
    240.39x = 72,385.95
  5. Step 5: Solve for x
    x = 72,385.95/240.39
  6. Step 6: Final answer
    x = 301.12

Related Problems

Find fourth proportional to 120.20, 165.61 and 109.28
Half scale
Find fourth proportional to 480.78, 662.42 and 437.10
Double scale
Find fourth proportional to 241.39, 332.59 and 219.55
Similar ratio
Find fourth proportional to 360.59, 496.82 and 327.83
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.