Home / 236.40-353.60-212.20

Finding the Fourth Proportional to 236.40, 353.60 and 212.20

Calculator

Solution

The fourth proportional to 236.40, 353.60 and 212.20 is: 317.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    236.40 : 353.60 = 212.20 : x
  2. Step 2: Convert to fraction form
    236.40/353.60 = 212.20/x
  3. Step 3: Cross multiply
    236.40x = 353.60 × 212.20
  4. Step 4: Simplify right side
    236.40x = 75,033.92
  5. Step 5: Solve for x
    x = 75,033.92/236.40
  6. Step 6: Final answer
    x = 317.40

Related Problems

Find fourth proportional to 118.20, 176.80 and 106.10
Half scale
Find fourth proportional to 472.80, 707.20 and 424.40
Double scale
Find fourth proportional to 237.40, 355.10 and 213.20
Similar ratio
Find fourth proportional to 354.60, 530.40 and 318.30
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.