Home / 1,208.59-1,811.79-478

Finding the Fourth Proportional to 1,208.59, 1,811.79 and 478

Calculator

Solution

The fourth proportional to 1,208.59, 1,811.79 and 478 is: 716.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.59 : 1,811.79 = 478 : x
  2. Step 2: Convert to fraction form
    1,208.59/1,811.79 = 478/x
  3. Step 3: Cross multiply
    1,208.59x = 1,811.79 × 478
  4. Step 4: Simplify right side
    1,208.59x = 866,035.62
  5. Step 5: Solve for x
    x = 866,035.62/1,208.59
  6. Step 6: Final answer
    x = 716.57

Related Problems

Find fourth proportional to 604.30, 905.90 and 239
Half scale
Find fourth proportional to 2,417.18, 3,623.58 and 956
Double scale
Find fourth proportional to 1,209.59, 1,813.29 and 479
Similar ratio
Find fourth proportional to 1,812.89, 2,717.69 and 717
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.