Home / 6.40-9.61-4

Finding the Fourth Proportional to 6.40, 9.61 and 4

Calculator

Solution

The fourth proportional to 6.40, 9.61 and 4 is: 6.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.40 : 9.61 = 4 : x
  2. Step 2: Convert to fraction form
    6.40/9.61 = 4/x
  3. Step 3: Cross multiply
    6.40x = 9.61 × 4
  4. Step 4: Simplify right side
    6.40x = 38.44
  5. Step 5: Solve for x
    x = 38.44/6.40
  6. Step 6: Final answer
    x = 6.01

Related Problems

Find fourth proportional to 3.20, 4.81 and 2
Half scale
Find fourth proportional to 12.80, 19.22 and 8
Double scale
Find fourth proportional to 7.40, 11.11 and 5
Similar ratio
Find fourth proportional to 9.60, 14.42 and 6
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.