Home / 229.96-345.03-85.78

Finding the Fourth Proportional to 229.96, 345.03 and 85.78

Calculator

Solution

The fourth proportional to 229.96, 345.03 and 85.78 is: 128.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.96 : 345.03 = 85.78 : x
  2. Step 2: Convert to fraction form
    229.96/345.03 = 85.78/x
  3. Step 3: Cross multiply
    229.96x = 345.03 × 85.78
  4. Step 4: Simplify right side
    229.96x = 29,596.67
  5. Step 5: Solve for x
    x = 29,596.67/229.96
  6. Step 6: Final answer
    x = 128.70

Related Problems

Find fourth proportional to 114.98, 172.52 and 42.89
Half scale
Find fourth proportional to 459.92, 690.06 and 171.56
Double scale
Find fourth proportional to 230.96, 346.53 and 86.78
Similar ratio
Find fourth proportional to 344.94, 517.55 and 128.67
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.