Home / 222.16-306.57-128.91

Finding the Fourth Proportional to 222.16, 306.57 and 128.91

Calculator

Solution

The fourth proportional to 222.16, 306.57 and 128.91 is: 177.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.16 : 306.57 = 128.91 : x
  2. Step 2: Convert to fraction form
    222.16/306.57 = 128.91/x
  3. Step 3: Cross multiply
    222.16x = 306.57 × 128.91
  4. Step 4: Simplify right side
    222.16x = 39,520.26
  5. Step 5: Solve for x
    x = 39,520.26/222.16
  6. Step 6: Final answer
    x = 177.89

Related Problems

Find fourth proportional to 111.08, 153.29 and 64.46
Half scale
Find fourth proportional to 444.32, 613.15 and 257.82
Double scale
Find fourth proportional to 223.16, 307.95 and 129.91
Similar ratio
Find fourth proportional to 333.24, 459.86 and 193.37
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.