Home / 1,187.68-1,781.34-418

Finding the Fourth Proportional to 1,187.68, 1,781.34 and 418

Calculator

Solution

The fourth proportional to 1,187.68, 1,781.34 and 418 is: 626.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.68 : 1,781.34 = 418 : x
  2. Step 2: Convert to fraction form
    1,187.68/1,781.34 = 418/x
  3. Step 3: Cross multiply
    1,187.68x = 1,781.34 × 418
  4. Step 4: Simplify right side
    1,187.68x = 744,600.12
  5. Step 5: Solve for x
    x = 744,600.12/1,187.68
  6. Step 6: Final answer
    x = 626.94

Related Problems

Find fourth proportional to 593.84, 890.67 and 209
Half scale
Find fourth proportional to 2,375.36, 3,562.68 and 836
Double scale
Find fourth proportional to 1,188.68, 1,782.84 and 419
Similar ratio
Find fourth proportional to 1,781.52, 2,672.01 and 627
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.