Home / 606.40-909.06-221.38

Finding the Fourth Proportional to 606.40, 909.06 and 221.38

Calculator

Solution

The fourth proportional to 606.40, 909.06 and 221.38 is: 331.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    606.40 : 909.06 = 221.38 : x
  2. Step 2: Convert to fraction form
    606.40/909.06 = 221.38/x
  3. Step 3: Cross multiply
    606.40x = 909.06 × 221.38
  4. Step 4: Simplify right side
    606.40x = 201,247.70
  5. Step 5: Solve for x
    x = 201,247.70/606.40
  6. Step 6: Final answer
    x = 331.87

Related Problems

Find fourth proportional to 303.20, 454.53 and 110.69
Half scale
Find fourth proportional to 1,212.80, 1,818.12 and 442.76
Double scale
Find fourth proportional to 607.40, 910.56 and 222.38
Similar ratio
Find fourth proportional to 909.60, 1,363.59 and 332.07
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.