Home / 1,311.56-1,968-662.30

Finding the Fourth Proportional to 1,311.56, 1,968 and 662.30

Calculator

Solution

The fourth proportional to 1,311.56, 1,968 and 662.30 is: 993.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.56 : 1,968 = 662.30 : x
  2. Step 2: Convert to fraction form
    1,311.56/1,968 = 662.30/x
  3. Step 3: Cross multiply
    1,311.56x = 1,968 × 662.30
  4. Step 4: Simplify right side
    1,311.56x = 1,303,406.40
  5. Step 5: Solve for x
    x = 1,303,406.40/1,311.56
  6. Step 6: Final answer
    x = 993.78

Related Problems

Find fourth proportional to 655.78, 984 and 331.15
Half scale
Find fourth proportional to 2,623.12, 3,936 and 1,324.60
Double scale
Find fourth proportional to 1,312.56, 1,969.50 and 663.30
Similar ratio
Find fourth proportional to 1,967.34, 2,952 and 993.45
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.