Home / 6.66-9.99-6

Finding the Fourth Proportional to 6.66, 9.99 and 6

Calculator

Solution

The fourth proportional to 6.66, 9.99 and 6 is: 9

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.66 : 9.99 = 6 : x
  2. Step 2: Convert to fraction form
    6.66/9.99 = 6/x
  3. Step 3: Cross multiply
    6.66x = 9.99 × 6
  4. Step 4: Simplify right side
    6.66x = 59.94
  5. Step 5: Solve for x
    x = 59.94/6.66
  6. Step 6: Final answer
    x = 9

Related Problems

Find fourth proportional to 3.33, 5.00 and 3
Half scale
Find fourth proportional to 13.32, 19.98 and 12
Double scale
Find fourth proportional to 7.66, 11.49 and 7
Similar ratio
Find fourth proportional to 9.99, 14.99 and 9
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.