Home / 194-268-128.72

Finding the Fourth Proportional to 194, 268 and 128.72

Calculator

Solution

The fourth proportional to 194, 268 and 128.72 is: 177.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    194 : 268 = 128.72 : x
  2. Step 2: Convert to fraction form
    194/268 = 128.72/x
  3. Step 3: Cross multiply
    194x = 268 × 128.72
  4. Step 4: Simplify right side
    194x = 34,496.96
  5. Step 5: Solve for x
    x = 34,496.96/194
  6. Step 6: Final answer
    x = 177.82

Related Problems

Find fourth proportional to 97, 134 and 64.36
Half scale
Find fourth proportional to 388, 536 and 257.44
Double scale
Find fourth proportional to 195, 269.38 and 129.72
Similar ratio
Find fourth proportional to 291, 402 and 193.08
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.