Home / 1,221-1,831.50-451.50

Finding the Fourth Proportional to 1,221, 1,831.50 and 451.50

Calculator

Solution

The fourth proportional to 1,221, 1,831.50 and 451.50 is: 677.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221 : 1,831.50 = 451.50 : x
  2. Step 2: Convert to fraction form
    1,221/1,831.50 = 451.50/x
  3. Step 3: Cross multiply
    1,221x = 1,831.50 × 451.50
  4. Step 4: Simplify right side
    1,221x = 826,922.25
  5. Step 5: Solve for x
    x = 826,922.25/1,221
  6. Step 6: Final answer
    x = 677.25

Related Problems

Find fourth proportional to 610.50, 915.75 and 225.75
Half scale
Find fourth proportional to 2,442, 3,663 and 903
Double scale
Find fourth proportional to 1,222, 1,833 and 452.50
Similar ratio
Find fourth proportional to 1,831.50, 2,747.25 and 677.25
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.