Home / 811-1,216.50-298

Finding the Fourth Proportional to 811, 1,216.50 and 298

Calculator

Solution

The fourth proportional to 811, 1,216.50 and 298 is: 447

Step by Step Solution

  1. Step 1: Write the proportion equation
    811 : 1,216.50 = 298 : x
  2. Step 2: Convert to fraction form
    811/1,216.50 = 298/x
  3. Step 3: Cross multiply
    811x = 1,216.50 × 298
  4. Step 4: Simplify right side
    811x = 362,517
  5. Step 5: Solve for x
    x = 362,517/811
  6. Step 6: Final answer
    x = 447

Related Problems

Find fourth proportional to 405.50, 608.25 and 149
Half scale
Find fourth proportional to 1,622, 2,433 and 596
Double scale
Find fourth proportional to 812, 1,218 and 299
Similar ratio
Find fourth proportional to 1,216.50, 1,824.75 and 447
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.