Home / 344.85-517.32-128.43

Finding the Fourth Proportional to 344.85, 517.32 and 128.43

Calculator

Solution

The fourth proportional to 344.85, 517.32 and 128.43 is: 192.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    344.85 : 517.32 = 128.43 : x
  2. Step 2: Convert to fraction form
    344.85/517.32 = 128.43/x
  3. Step 3: Cross multiply
    344.85x = 517.32 × 128.43
  4. Step 4: Simplify right side
    344.85x = 66,439.41
  5. Step 5: Solve for x
    x = 66,439.41/344.85
  6. Step 6: Final answer
    x = 192.66

Related Problems

Find fourth proportional to 172.43, 258.66 and 64.22
Half scale
Find fourth proportional to 689.70, 1,034.64 and 256.86
Double scale
Find fourth proportional to 345.85, 518.82 and 129.43
Similar ratio
Find fourth proportional to 517.28, 775.98 and 192.65
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.