Home / 238.56-357.76-128.88

Finding the Fourth Proportional to 238.56, 357.76 and 128.88

Calculator

Solution

The fourth proportional to 238.56, 357.76 and 128.88 is: 193.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.56 : 357.76 = 128.88 : x
  2. Step 2: Convert to fraction form
    238.56/357.76 = 128.88/x
  3. Step 3: Cross multiply
    238.56x = 357.76 × 128.88
  4. Step 4: Simplify right side
    238.56x = 46,108.11
  5. Step 5: Solve for x
    x = 46,108.11/238.56
  6. Step 6: Final answer
    x = 193.28

Related Problems

Find fourth proportional to 119.28, 178.88 and 64.44
Half scale
Find fourth proportional to 477.12, 715.52 and 257.76
Double scale
Find fourth proportional to 239.56, 359.26 and 129.88
Similar ratio
Find fourth proportional to 357.84, 536.64 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.