Home / 1,911.87-2,868-679.39

Finding the Fourth Proportional to 1,911.87, 2,868 and 679.39

Calculator

Solution

The fourth proportional to 1,911.87, 2,868 and 679.39 is: 1,019.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.87 : 2,868 = 679.39 : x
  2. Step 2: Convert to fraction form
    1,911.87/2,868 = 679.39/x
  3. Step 3: Cross multiply
    1,911.87x = 2,868 × 679.39
  4. Step 4: Simplify right side
    1,911.87x = 1,948,490.52
  5. Step 5: Solve for x
    x = 1,948,490.52/1,911.87
  6. Step 6: Final answer
    x = 1,019.16

Related Problems

Find fourth proportional to 955.93, 1,434 and 339.70
Half scale
Find fourth proportional to 3,823.73, 5,736 and 1,358.78
Double scale
Find fourth proportional to 1,912.87, 2,869.50 and 680.39
Similar ratio
Find fourth proportional to 2,867.80, 4,302 and 1,019.09
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.