Home / 81,138-121,707-25,734

Finding the Fourth Proportional to 81,138, 121,707 and 25,734

Calculator

Solution

The fourth proportional to 81,138, 121,707 and 25,734 is: 38,601

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,138 : 121,707 = 25,734 : x
  2. Step 2: Convert to fraction form
    81,138/121,707 = 25,734/x
  3. Step 3: Cross multiply
    81,138x = 121,707 × 25,734
  4. Step 4: Simplify right side
    81,138x = 3,132,007,938
  5. Step 5: Solve for x
    x = 3,132,007,938/81,138
  6. Step 6: Final answer
    x = 38,601

Related Problems

Find fourth proportional to 40,569, 60,853.50 and 12,867
Half scale
Find fourth proportional to 162,276, 243,414 and 51,468
Double scale
Find fourth proportional to 81,139, 121,708.50 and 25,735
Similar ratio
Find fourth proportional to 121,707, 182,560.50 and 38,601
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.