Home / 550.69-759.95-311.39

Finding the Fourth Proportional to 550.69, 759.95 and 311.39

Calculator

Solution

The fourth proportional to 550.69, 759.95 and 311.39 is: 429.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    550.69 : 759.95 = 311.39 : x
  2. Step 2: Convert to fraction form
    550.69/759.95 = 311.39/x
  3. Step 3: Cross multiply
    550.69x = 759.95 × 311.39
  4. Step 4: Simplify right side
    550.69x = 236,640.83
  5. Step 5: Solve for x
    x = 236,640.83/550.69
  6. Step 6: Final answer
    x = 429.72

Related Problems

Find fourth proportional to 275.35, 379.98 and 155.70
Half scale
Find fourth proportional to 1,101.38, 1,519.90 and 622.78
Double scale
Find fourth proportional to 551.69, 761.33 and 312.39
Similar ratio
Find fourth proportional to 826.04, 1,139.93 and 467.09
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.