Home / 444-612.90-289.20

Finding the Fourth Proportional to 444, 612.90 and 289.20

Calculator

Solution

The fourth proportional to 444, 612.90 and 289.20 is: 399.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    444 : 612.90 = 289.20 : x
  2. Step 2: Convert to fraction form
    444/612.90 = 289.20/x
  3. Step 3: Cross multiply
    444x = 612.90 × 289.20
  4. Step 4: Simplify right side
    444x = 177,250.68
  5. Step 5: Solve for x
    x = 177,250.68/444
  6. Step 6: Final answer
    x = 399.21

Related Problems

Find fourth proportional to 222, 306.45 and 144.60
Half scale
Find fourth proportional to 888, 1,225.80 and 578.40
Double scale
Find fourth proportional to 445, 614.28 and 290.20
Similar ratio
Find fourth proportional to 666, 919.35 and 433.80
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.