Home / 254-381-83

Finding the Fourth Proportional to 254, 381 and 83

Calculator

Solution

The fourth proportional to 254, 381 and 83 is: 124.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    254 : 381 = 83 : x
  2. Step 2: Convert to fraction form
    254/381 = 83/x
  3. Step 3: Cross multiply
    254x = 381 × 83
  4. Step 4: Simplify right side
    254x = 31,623
  5. Step 5: Solve for x
    x = 31,623/254
  6. Step 6: Final answer
    x = 124.50

Related Problems

Find fourth proportional to 127, 190.50 and 41.50
Half scale
Find fourth proportional to 508, 762 and 166
Double scale
Find fourth proportional to 255, 382.50 and 84
Similar ratio
Find fourth proportional to 381, 571.50 and 124.50
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.