Home / 170.68-255.90-138.76

Finding the Fourth Proportional to 170.68, 255.90 and 138.76

Calculator

Solution

The fourth proportional to 170.68, 255.90 and 138.76 is: 208.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.68 : 255.90 = 138.76 : x
  2. Step 2: Convert to fraction form
    170.68/255.90 = 138.76/x
  3. Step 3: Cross multiply
    170.68x = 255.90 × 138.76
  4. Step 4: Simplify right side
    170.68x = 35,508.68
  5. Step 5: Solve for x
    x = 35,508.68/170.68
  6. Step 6: Final answer
    x = 208.04

Related Problems

Find fourth proportional to 85.34, 127.95 and 69.38
Half scale
Find fourth proportional to 341.36, 511.80 and 277.52
Double scale
Find fourth proportional to 171.68, 257.40 and 139.76
Similar ratio
Find fourth proportional to 256.02, 383.85 and 208.14
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.