Home / 432.85-648.86-172.78

Finding the Fourth Proportional to 432.85, 648.86 and 172.78

Calculator

Solution

The fourth proportional to 432.85, 648.86 and 172.78 is: 258.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.85 : 648.86 = 172.78 : x
  2. Step 2: Convert to fraction form
    432.85/648.86 = 172.78/x
  3. Step 3: Cross multiply
    432.85x = 648.86 × 172.78
  4. Step 4: Simplify right side
    432.85x = 112,105.92
  5. Step 5: Solve for x
    x = 112,105.92/432.85
  6. Step 6: Final answer
    x = 258.99

Related Problems

Find fourth proportional to 216.43, 324.43 and 86.39
Half scale
Find fourth proportional to 865.71, 1,297.71 and 345.55
Double scale
Find fourth proportional to 433.85, 650.35 and 173.78
Similar ratio
Find fourth proportional to 649.28, 973.28 and 259.16
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.