Home / 7.15-9.85-6

Finding the Fourth Proportional to 7.15, 9.85 and 6

Calculator

Solution

The fourth proportional to 7.15, 9.85 and 6 is: 8.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.15 : 9.85 = 6 : x
  2. Step 2: Convert to fraction form
    7.15/9.85 = 6/x
  3. Step 3: Cross multiply
    7.15x = 9.85 × 6
  4. Step 4: Simplify right side
    7.15x = 59.10
  5. Step 5: Solve for x
    x = 59.10/7.15
  6. Step 6: Final answer
    x = 8.27

Related Problems

Find fourth proportional to 3.58, 4.93 and 3
Half scale
Find fourth proportional to 14.30, 19.70 and 12
Double scale
Find fourth proportional to 8.15, 11.23 and 7
Similar ratio
Find fourth proportional to 10.73, 14.78 and 9
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.