Home / 633.20-949.80-309.20

Finding the Fourth Proportional to 633.20, 949.80 and 309.20

Calculator

Solution

The fourth proportional to 633.20, 949.80 and 309.20 is: 463.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    633.20 : 949.80 = 309.20 : x
  2. Step 2: Convert to fraction form
    633.20/949.80 = 309.20/x
  3. Step 3: Cross multiply
    633.20x = 949.80 × 309.20
  4. Step 4: Simplify right side
    633.20x = 293,678.16
  5. Step 5: Solve for x
    x = 293,678.16/633.20
  6. Step 6: Final answer
    x = 463.80

Related Problems

Find fourth proportional to 316.60, 474.90 and 154.60
Half scale
Find fourth proportional to 1,266.40, 1,899.60 and 618.40
Double scale
Find fourth proportional to 634.20, 951.30 and 310.20
Similar ratio
Find fourth proportional to 949.80, 1,424.70 and 463.80
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.