Home / 299.70-448.20-285.12

Finding the Fourth Proportional to 299.70, 448.20 and 285.12

Calculator

Solution

The fourth proportional to 299.70, 448.20 and 285.12 is: 426.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.70 : 448.20 = 285.12 : x
  2. Step 2: Convert to fraction form
    299.70/448.20 = 285.12/x
  3. Step 3: Cross multiply
    299.70x = 448.20 × 285.12
  4. Step 4: Simplify right side
    299.70x = 127,790.78
  5. Step 5: Solve for x
    x = 127,790.78/299.70
  6. Step 6: Final answer
    x = 426.40

Related Problems

Find fourth proportional to 149.85, 224.10 and 142.56
Half scale
Find fourth proportional to 599.40, 896.40 and 570.24
Double scale
Find fourth proportional to 300.70, 449.70 and 286.12
Similar ratio
Find fourth proportional to 449.55, 672.30 and 427.68
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.