Home / 2.65-4-2.65

Finding the Fourth Proportional to 2.65, 4 and 2.65

Calculator

Solution

The fourth proportional to 2.65, 4 and 2.65 is: 4

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.65 : 4 = 2.65 : x
  2. Step 2: Convert to fraction form
    2.65/4 = 2.65/x
  3. Step 3: Cross multiply
    2.65x = 4 × 2.65
  4. Step 4: Simplify right side
    2.65x = 10.59
  5. Step 5: Solve for x
    x = 10.59/2.65
  6. Step 6: Final answer
    x = 4

Related Problems

Find fourth proportional to 1.32, 2 and 1.32
Half scale
Find fourth proportional to 5.30, 8 and 5.30
Double scale
Find fourth proportional to 3.65, 5.51 and 3.65
Similar ratio
Find fourth proportional to 3.97, 6 and 3.97
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.