Home / 1,240.94-1,712-709.74

Finding the Fourth Proportional to 1,240.94, 1,712 and 709.74

Calculator

Solution

The fourth proportional to 1,240.94, 1,712 and 709.74 is: 979.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.94 : 1,712 = 709.74 : x
  2. Step 2: Convert to fraction form
    1,240.94/1,712 = 709.74/x
  3. Step 3: Cross multiply
    1,240.94x = 1,712 × 709.74
  4. Step 4: Simplify right side
    1,240.94x = 1,215,074.88
  5. Step 5: Solve for x
    x = 1,215,074.88/1,240.94
  6. Step 6: Final answer
    x = 979.16

Related Problems

Find fourth proportional to 620.47, 856 and 354.87
Half scale
Find fourth proportional to 2,481.88, 3,424 and 1,419.48
Double scale
Find fourth proportional to 1,241.94, 1,713.38 and 710.74
Similar ratio
Find fourth proportional to 1,861.41, 2,568 and 1,064.61
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.