Home / 1,221.94-1,686.30-698

Finding the Fourth Proportional to 1,221.94, 1,686.30 and 698

Calculator

Solution

The fourth proportional to 1,221.94, 1,686.30 and 698 is: 963.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.94 : 1,686.30 = 698 : x
  2. Step 2: Convert to fraction form
    1,221.94/1,686.30 = 698/x
  3. Step 3: Cross multiply
    1,221.94x = 1,686.30 × 698
  4. Step 4: Simplify right side
    1,221.94x = 1,177,037.40
  5. Step 5: Solve for x
    x = 1,177,037.40/1,221.94
  6. Step 6: Final answer
    x = 963.25

Related Problems

Find fourth proportional to 610.97, 843.15 and 349
Half scale
Find fourth proportional to 2,443.88, 3,372.60 and 1,396
Double scale
Find fourth proportional to 1,222.94, 1,687.68 and 699
Similar ratio
Find fourth proportional to 1,832.91, 2,529.45 and 1,047
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.