Home / 5.60-8.40-4

Finding the Fourth Proportional to 5.60, 8.40 and 4

Calculator

Solution

The fourth proportional to 5.60, 8.40 and 4 is: 6.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.60 : 8.40 = 4 : x
  2. Step 2: Convert to fraction form
    5.60/8.40 = 4/x
  3. Step 3: Cross multiply
    5.60x = 8.40 × 4
  4. Step 4: Simplify right side
    5.60x = 33.60
  5. Step 5: Solve for x
    x = 33.60/5.60
  6. Step 6: Final answer
    x = 6.00

Related Problems

Find fourth proportional to 2.80, 4.20 and 2
Half scale
Find fourth proportional to 11.20, 16.80 and 8
Double scale
Find fourth proportional to 6.60, 9.90 and 5
Similar ratio
Find fourth proportional to 8.40, 12.60 and 6
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.