Home / 336.78-505.01-128.59

Finding the Fourth Proportional to 336.78, 505.01 and 128.59

Calculator

Solution

The fourth proportional to 336.78, 505.01 and 128.59 is: 192.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    336.78 : 505.01 = 128.59 : x
  2. Step 2: Convert to fraction form
    336.78/505.01 = 128.59/x
  3. Step 3: Cross multiply
    336.78x = 505.01 × 128.59
  4. Step 4: Simplify right side
    336.78x = 64,938.29
  5. Step 5: Solve for x
    x = 64,938.29/336.78
  6. Step 6: Final answer
    x = 192.82

Related Problems

Find fourth proportional to 168.39, 252.51 and 64.29
Half scale
Find fourth proportional to 673.56, 1,010.03 and 257.18
Double scale
Find fourth proportional to 337.78, 506.51 and 129.59
Similar ratio
Find fourth proportional to 505.17, 757.52 and 192.88
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.