Home / 439.68-659.50-318

Finding the Fourth Proportional to 439.68, 659.50 and 318

Calculator

Solution

The fourth proportional to 439.68, 659.50 and 318 is: 476.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.68 : 659.50 = 318 : x
  2. Step 2: Convert to fraction form
    439.68/659.50 = 318/x
  3. Step 3: Cross multiply
    439.68x = 659.50 × 318
  4. Step 4: Simplify right side
    439.68x = 209,721
  5. Step 5: Solve for x
    x = 209,721/439.68
  6. Step 6: Final answer
    x = 476.99

Related Problems

Find fourth proportional to 219.84, 329.75 and 159
Half scale
Find fourth proportional to 879.36, 1,319 and 636
Double scale
Find fourth proportional to 440.68, 661 and 319
Similar ratio
Find fourth proportional to 659.52, 989.25 and 477
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.