Home / 448.10-672.04-139.78

Finding the Fourth Proportional to 448.10, 672.04 and 139.78

Calculator

Solution

The fourth proportional to 448.10, 672.04 and 139.78 is: 209.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.10 : 672.04 = 139.78 : x
  2. Step 2: Convert to fraction form
    448.10/672.04 = 139.78/x
  3. Step 3: Cross multiply
    448.10x = 672.04 × 139.78
  4. Step 4: Simplify right side
    448.10x = 93,937.75
  5. Step 5: Solve for x
    x = 93,937.75/448.10
  6. Step 6: Final answer
    x = 209.64

Related Problems

Find fourth proportional to 224.05, 336.02 and 69.89
Half scale
Find fourth proportional to 896.20, 1,344.08 and 279.56
Double scale
Find fourth proportional to 449.10, 673.54 and 140.78
Similar ratio
Find fourth proportional to 672.15, 1,008.06 and 209.67
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.