Home / 751.62-1,128-478.26

Finding the Fourth Proportional to 751.62, 1,128 and 478.26

Calculator

Solution

The fourth proportional to 751.62, 1,128 and 478.26 is: 717.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.62 : 1,128 = 478.26 : x
  2. Step 2: Convert to fraction form
    751.62/1,128 = 478.26/x
  3. Step 3: Cross multiply
    751.62x = 1,128 × 478.26
  4. Step 4: Simplify right side
    751.62x = 539,477.28
  5. Step 5: Solve for x
    x = 539,477.28/751.62
  6. Step 6: Final answer
    x = 717.75

Related Problems

Find fourth proportional to 375.81, 564 and 239.13
Half scale
Find fourth proportional to 1,503.24, 2,256 and 956.52
Double scale
Find fourth proportional to 752.62, 1,129.50 and 479.26
Similar ratio
Find fourth proportional to 1,127.43, 1,692 and 717.39
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.