Home / 553.66-830.40-142.78

Finding the Fourth Proportional to 553.66, 830.40 and 142.78

Calculator

Solution

The fourth proportional to 553.66, 830.40 and 142.78 is: 214.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.66 : 830.40 = 142.78 : x
  2. Step 2: Convert to fraction form
    553.66/830.40 = 142.78/x
  3. Step 3: Cross multiply
    553.66x = 830.40 × 142.78
  4. Step 4: Simplify right side
    553.66x = 118,563.73
  5. Step 5: Solve for x
    x = 118,563.73/553.66
  6. Step 6: Final answer
    x = 214.15

Related Problems

Find fourth proportional to 276.83, 415.20 and 71.39
Half scale
Find fourth proportional to 1,107.32, 1,660.80 and 285.56
Double scale
Find fourth proportional to 554.66, 831.90 and 143.78
Similar ratio
Find fourth proportional to 830.49, 1,245.60 and 214.17
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.