Home / 141.28-211.90-80.40

Finding the Fourth Proportional to 141.28, 211.90 and 80.40

Calculator

Solution

The fourth proportional to 141.28, 211.90 and 80.40 is: 120.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.28 : 211.90 = 80.40 : x
  2. Step 2: Convert to fraction form
    141.28/211.90 = 80.40/x
  3. Step 3: Cross multiply
    141.28x = 211.90 × 80.40
  4. Step 4: Simplify right side
    141.28x = 17,036.76
  5. Step 5: Solve for x
    x = 17,036.76/141.28
  6. Step 6: Final answer
    x = 120.59

Related Problems

Find fourth proportional to 70.64, 105.95 and 40.20
Half scale
Find fourth proportional to 282.56, 423.80 and 160.80
Double scale
Find fourth proportional to 142.28, 213.40 and 81.40
Similar ratio
Find fourth proportional to 211.92, 317.85 and 120.60
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.