Home / 233.31-321.98-128.42

Finding the Fourth Proportional to 233.31, 321.98 and 128.42

Calculator

Solution

The fourth proportional to 233.31, 321.98 and 128.42 is: 177.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    233.31 : 321.98 = 128.42 : x
  2. Step 2: Convert to fraction form
    233.31/321.98 = 128.42/x
  3. Step 3: Cross multiply
    233.31x = 321.98 × 128.42
  4. Step 4: Simplify right side
    233.31x = 41,347.45
  5. Step 5: Solve for x
    x = 41,347.45/233.31
  6. Step 6: Final answer
    x = 177.22

Related Problems

Find fourth proportional to 116.65, 160.99 and 64.21
Half scale
Find fourth proportional to 466.61, 643.95 and 256.83
Double scale
Find fourth proportional to 234.31, 323.36 and 129.42
Similar ratio
Find fourth proportional to 349.96, 482.97 and 192.63
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.