Home / 424.12-636.30-279.64

Finding the Fourth Proportional to 424.12, 636.30 and 279.64

Calculator

Solution

The fourth proportional to 424.12, 636.30 and 279.64 is: 419.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.12 : 636.30 = 279.64 : x
  2. Step 2: Convert to fraction form
    424.12/636.30 = 279.64/x
  3. Step 3: Cross multiply
    424.12x = 636.30 × 279.64
  4. Step 4: Simplify right side
    424.12x = 177,934.93
  5. Step 5: Solve for x
    x = 177,934.93/424.12
  6. Step 6: Final answer
    x = 419.54

Related Problems

Find fourth proportional to 212.06, 318.15 and 139.82
Half scale
Find fourth proportional to 848.24, 1,272.60 and 559.28
Double scale
Find fourth proportional to 425.12, 637.80 and 280.64
Similar ratio
Find fourth proportional to 636.18, 954.45 and 419.46
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.