Home / 1,280.47-1,919.85-447.34

Finding the Fourth Proportional to 1,280.47, 1,919.85 and 447.34

Calculator

Solution

The fourth proportional to 1,280.47, 1,919.85 and 447.34 is: 670.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.47 : 1,919.85 = 447.34 : x
  2. Step 2: Convert to fraction form
    1,280.47/1,919.85 = 447.34/x
  3. Step 3: Cross multiply
    1,280.47x = 1,919.85 × 447.34
  4. Step 4: Simplify right side
    1,280.47x = 858,825.70
  5. Step 5: Solve for x
    x = 858,825.70/1,280.47
  6. Step 6: Final answer
    x = 670.71

Related Problems

Find fourth proportional to 640.24, 959.93 and 223.67
Half scale
Find fourth proportional to 2,560.94, 3,839.70 and 894.68
Double scale
Find fourth proportional to 1,281.47, 1,921.35 and 448.34
Similar ratio
Find fourth proportional to 1,920.71, 2,879.78 and 671.01
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.