Home / 3.98-6-3.87

Finding the Fourth Proportional to 3.98, 6 and 3.87

Calculator

Solution

The fourth proportional to 3.98, 6 and 3.87 is: 5.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.98 : 6 = 3.87 : x
  2. Step 2: Convert to fraction form
    3.98/6 = 3.87/x
  3. Step 3: Cross multiply
    3.98x = 6 × 3.87
  4. Step 4: Simplify right side
    3.98x = 23.22
  5. Step 5: Solve for x
    x = 23.22/3.98
  6. Step 6: Final answer
    x = 5.83

Related Problems

Find fourth proportional to 1.99, 3 and 1.94
Half scale
Find fourth proportional to 7.96, 12 and 7.74
Double scale
Find fourth proportional to 4.98, 7.51 and 4.87
Similar ratio
Find fourth proportional to 5.97, 9 and 5.81
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.