Home / 484.30-668.40-287.80

Finding the Fourth Proportional to 484.30, 668.40 and 287.80

Calculator

Solution

The fourth proportional to 484.30, 668.40 and 287.80 is: 397.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    484.30 : 668.40 = 287.80 : x
  2. Step 2: Convert to fraction form
    484.30/668.40 = 287.80/x
  3. Step 3: Cross multiply
    484.30x = 668.40 × 287.80
  4. Step 4: Simplify right side
    484.30x = 192,365.52
  5. Step 5: Solve for x
    x = 192,365.52/484.30
  6. Step 6: Final answer
    x = 397.20

Related Problems

Find fourth proportional to 242.15, 334.20 and 143.90
Half scale
Find fourth proportional to 968.60, 1,336.80 and 575.60
Double scale
Find fourth proportional to 485.30, 669.78 and 288.80
Similar ratio
Find fourth proportional to 726.45, 1,002.60 and 431.70
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.