Home / 4.21-6.35-4

Finding the Fourth Proportional to 4.21, 6.35 and 4

Calculator

Solution

The fourth proportional to 4.21, 6.35 and 4 is: 6.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.21 : 6.35 = 4 : x
  2. Step 2: Convert to fraction form
    4.21/6.35 = 4/x
  3. Step 3: Cross multiply
    4.21x = 6.35 × 4
  4. Step 4: Simplify right side
    4.21x = 25.40
  5. Step 5: Solve for x
    x = 25.40/4.21
  6. Step 6: Final answer
    x = 6.03

Related Problems

Find fourth proportional to 2.11, 3.18 and 2
Half scale
Find fourth proportional to 8.42, 12.70 and 8
Double scale
Find fourth proportional to 5.21, 7.86 and 5
Similar ratio
Find fourth proportional to 6.32, 9.53 and 6
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.