Home / 268.30-402.53-85.69

Finding the Fourth Proportional to 268.30, 402.53 and 85.69

Calculator

Solution

The fourth proportional to 268.30, 402.53 and 85.69 is: 128.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.30 : 402.53 = 85.69 : x
  2. Step 2: Convert to fraction form
    268.30/402.53 = 85.69/x
  3. Step 3: Cross multiply
    268.30x = 402.53 × 85.69
  4. Step 4: Simplify right side
    268.30x = 34,492.87
  5. Step 5: Solve for x
    x = 34,492.87/268.30
  6. Step 6: Final answer
    x = 128.56

Related Problems

Find fourth proportional to 134.15, 201.26 and 42.85
Half scale
Find fourth proportional to 536.60, 805.05 and 171.38
Double scale
Find fourth proportional to 269.30, 404.03 and 86.69
Similar ratio
Find fourth proportional to 402.45, 603.79 and 128.54
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.