Home / 461.28-636.17-399.09

Finding the Fourth Proportional to 461.28, 636.17 and 399.09

Calculator

Solution

The fourth proportional to 461.28, 636.17 and 399.09 is: 550.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.28 : 636.17 = 399.09 : x
  2. Step 2: Convert to fraction form
    461.28/636.17 = 399.09/x
  3. Step 3: Cross multiply
    461.28x = 636.17 × 399.09
  4. Step 4: Simplify right side
    461.28x = 253,887.09
  5. Step 5: Solve for x
    x = 253,887.09/461.28
  6. Step 6: Final answer
    x = 550.40

Related Problems

Find fourth proportional to 230.64, 318.08 and 199.55
Half scale
Find fourth proportional to 922.56, 1,272.33 and 798.18
Double scale
Find fourth proportional to 462.28, 637.54 and 400.09
Similar ratio
Find fourth proportional to 691.92, 954.25 and 598.64
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.