Home / 266.61-399.30-220.65

Finding the Fourth Proportional to 266.61, 399.30 and 220.65

Calculator

Solution

The fourth proportional to 266.61, 399.30 and 220.65 is: 330.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.61 : 399.30 = 220.65 : x
  2. Step 2: Convert to fraction form
    266.61/399.30 = 220.65/x
  3. Step 3: Cross multiply
    266.61x = 399.30 × 220.65
  4. Step 4: Simplify right side
    266.61x = 88,105.55
  5. Step 5: Solve for x
    x = 88,105.55/266.61
  6. Step 6: Final answer
    x = 330.47

Related Problems

Find fourth proportional to 133.31, 199.65 and 110.33
Half scale
Find fourth proportional to 533.22, 798.60 and 441.30
Double scale
Find fourth proportional to 267.61, 400.80 and 221.65
Similar ratio
Find fourth proportional to 399.92, 598.95 and 330.98
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.