Home / 1,251.90-1,728-878.97

Finding the Fourth Proportional to 1,251.90, 1,728 and 878.97

Calculator

Solution

The fourth proportional to 1,251.90, 1,728 and 878.97 is: 1,213.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.90 : 1,728 = 878.97 : x
  2. Step 2: Convert to fraction form
    1,251.90/1,728 = 878.97/x
  3. Step 3: Cross multiply
    1,251.90x = 1,728 × 878.97
  4. Step 4: Simplify right side
    1,251.90x = 1,518,860.16
  5. Step 5: Solve for x
    x = 1,518,860.16/1,251.90
  6. Step 6: Final answer
    x = 1,213.24

Related Problems

Find fourth proportional to 625.95, 864 and 439.49
Half scale
Find fourth proportional to 2,503.80, 3,456 and 1,757.94
Double scale
Find fourth proportional to 1,252.90, 1,729.38 and 879.97
Similar ratio
Find fourth proportional to 1,877.85, 2,592 and 1,318.46
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.