Home / 334.28-501.31-128.91

Finding the Fourth Proportional to 334.28, 501.31 and 128.91

Calculator

Solution

The fourth proportional to 334.28, 501.31 and 128.91 is: 193.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    334.28 : 501.31 = 128.91 : x
  2. Step 2: Convert to fraction form
    334.28/501.31 = 128.91/x
  3. Step 3: Cross multiply
    334.28x = 501.31 × 128.91
  4. Step 4: Simplify right side
    334.28x = 64,623.87
  5. Step 5: Solve for x
    x = 64,623.87/334.28
  6. Step 6: Final answer
    x = 193.32

Related Problems

Find fourth proportional to 167.14, 250.66 and 64.46
Half scale
Find fourth proportional to 668.56, 1,002.62 and 257.82
Double scale
Find fourth proportional to 335.28, 502.81 and 129.91
Similar ratio
Find fourth proportional to 501.42, 751.97 and 193.37
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.