Home / 494.78-742.21-170.15

Finding the Fourth Proportional to 494.78, 742.21 and 170.15

Calculator

Solution

The fourth proportional to 494.78, 742.21 and 170.15 is: 255.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.78 : 742.21 = 170.15 : x
  2. Step 2: Convert to fraction form
    494.78/742.21 = 170.15/x
  3. Step 3: Cross multiply
    494.78x = 742.21 × 170.15
  4. Step 4: Simplify right side
    494.78x = 126,282.90
  5. Step 5: Solve for x
    x = 126,282.90/494.78
  6. Step 6: Final answer
    x = 255.23

Related Problems

Find fourth proportional to 247.39, 371.10 and 85.07
Half scale
Find fourth proportional to 989.55, 1,484.42 and 340.29
Double scale
Find fourth proportional to 495.78, 743.71 and 171.15
Similar ratio
Find fourth proportional to 742.16, 1,113.31 and 255.22
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.