Home / 333.90-500.76-128.57

Finding the Fourth Proportional to 333.90, 500.76 and 128.57

Calculator

Solution

The fourth proportional to 333.90, 500.76 and 128.57 is: 192.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    333.90 : 500.76 = 128.57 : x
  2. Step 2: Convert to fraction form
    333.90/500.76 = 128.57/x
  3. Step 3: Cross multiply
    333.90x = 500.76 × 128.57
  4. Step 4: Simplify right side
    333.90x = 64,380.21
  5. Step 5: Solve for x
    x = 64,380.21/333.90
  6. Step 6: Final answer
    x = 192.81

Related Problems

Find fourth proportional to 166.95, 250.38 and 64.28
Half scale
Find fourth proportional to 667.80, 1,001.52 and 257.13
Double scale
Find fourth proportional to 334.90, 502.26 and 129.57
Similar ratio
Find fourth proportional to 500.85, 751.14 and 192.85
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.