Home / 237.20-355.60-128.88

Finding the Fourth Proportional to 237.20, 355.60 and 128.88

Calculator

Solution

The fourth proportional to 237.20, 355.60 and 128.88 is: 193.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    237.20 : 355.60 = 128.88 : x
  2. Step 2: Convert to fraction form
    237.20/355.60 = 128.88/x
  3. Step 3: Cross multiply
    237.20x = 355.60 × 128.88
  4. Step 4: Simplify right side
    237.20x = 45,829.73
  5. Step 5: Solve for x
    x = 45,829.73/237.20
  6. Step 6: Final answer
    x = 193.21

Related Problems

Find fourth proportional to 118.60, 177.80 and 64.44
Half scale
Find fourth proportional to 474.40, 711.20 and 257.76
Double scale
Find fourth proportional to 238.20, 357.10 and 129.88
Similar ratio
Find fourth proportional to 355.80, 533.40 and 193.32
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.