Home / 6.30-8.70-6

Finding the Fourth Proportional to 6.30, 8.70 and 6

Calculator

Solution

The fourth proportional to 6.30, 8.70 and 6 is: 8.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.30 : 8.70 = 6 : x
  2. Step 2: Convert to fraction form
    6.30/8.70 = 6/x
  3. Step 3: Cross multiply
    6.30x = 8.70 × 6
  4. Step 4: Simplify right side
    6.30x = 52.20
  5. Step 5: Solve for x
    x = 52.20/6.30
  6. Step 6: Final answer
    x = 8.29

Related Problems

Find fourth proportional to 3.15, 4.35 and 3
Half scale
Find fourth proportional to 12.60, 17.40 and 12
Double scale
Find fourth proportional to 7.30, 10.08 and 7
Similar ratio
Find fourth proportional to 9.45, 13.05 and 9
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.