Home / 494.50-742-220.78

Finding the Fourth Proportional to 494.50, 742 and 220.78

Calculator

Solution

The fourth proportional to 494.50, 742 and 220.78 is: 331.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.50 : 742 = 220.78 : x
  2. Step 2: Convert to fraction form
    494.50/742 = 220.78/x
  3. Step 3: Cross multiply
    494.50x = 742 × 220.78
  4. Step 4: Simplify right side
    494.50x = 163,818.76
  5. Step 5: Solve for x
    x = 163,818.76/494.50
  6. Step 6: Final answer
    x = 331.28

Related Problems

Find fourth proportional to 247.25, 371 and 110.39
Half scale
Find fourth proportional to 989, 1,484 and 441.56
Double scale
Find fourth proportional to 495.50, 743.50 and 221.78
Similar ratio
Find fourth proportional to 741.75, 1,113 and 331.17
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.