Home / 2.90-4-2.82

Finding the Fourth Proportional to 2.90, 4 and 2.82

Calculator

Solution

The fourth proportional to 2.90, 4 and 2.82 is: 3.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.90 : 4 = 2.82 : x
  2. Step 2: Convert to fraction form
    2.90/4 = 2.82/x
  3. Step 3: Cross multiply
    2.90x = 4 × 2.82
  4. Step 4: Simplify right side
    2.90x = 11.28
  5. Step 5: Solve for x
    x = 11.28/2.90
  6. Step 6: Final answer
    x = 3.89

Related Problems

Find fourth proportional to 1.45, 2 and 1.41
Half scale
Find fourth proportional to 5.80, 8 and 5.64
Double scale
Find fourth proportional to 3.90, 5.38 and 3.82
Similar ratio
Find fourth proportional to 4.35, 6 and 4.23
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.