Home / 352.55-486.30-221.64

Finding the Fourth Proportional to 352.55, 486.30 and 221.64

Calculator

Solution

The fourth proportional to 352.55, 486.30 and 221.64 is: 305.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.55 : 486.30 = 221.64 : x
  2. Step 2: Convert to fraction form
    352.55/486.30 = 221.64/x
  3. Step 3: Cross multiply
    352.55x = 486.30 × 221.64
  4. Step 4: Simplify right side
    352.55x = 107,782.54
  5. Step 5: Solve for x
    x = 107,782.54/352.55
  6. Step 6: Final answer
    x = 305.72

Related Problems

Find fourth proportional to 176.28, 243.15 and 110.82
Half scale
Find fourth proportional to 705.11, 972.61 and 443.27
Double scale
Find fourth proportional to 353.55, 487.68 and 222.64
Similar ratio
Find fourth proportional to 528.83, 729.46 and 332.45
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.