Home / 12,150-18,225-3,942

Finding the Fourth Proportional to 12,150, 18,225 and 3,942

Calculator

Solution

The fourth proportional to 12,150, 18,225 and 3,942 is: 5,913

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,150 : 18,225 = 3,942 : x
  2. Step 2: Convert to fraction form
    12,150/18,225 = 3,942/x
  3. Step 3: Cross multiply
    12,150x = 18,225 × 3,942
  4. Step 4: Simplify right side
    12,150x = 71,842,950
  5. Step 5: Solve for x
    x = 71,842,950/12,150
  6. Step 6: Final answer
    x = 5,913

Related Problems

Find fourth proportional to 6,075, 9,112.50 and 1,971
Half scale
Find fourth proportional to 24,300, 36,450 and 7,884
Double scale
Find fourth proportional to 12,151, 18,226.50 and 3,943
Similar ratio
Find fourth proportional to 18,225, 27,337.50 and 5,913
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.