Home / 632.40-947.70-439.80

Finding the Fourth Proportional to 632.40, 947.70 and 439.80

Calculator

Solution

The fourth proportional to 632.40, 947.70 and 439.80 is: 659.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    632.40 : 947.70 = 439.80 : x
  2. Step 2: Convert to fraction form
    632.40/947.70 = 439.80/x
  3. Step 3: Cross multiply
    632.40x = 947.70 × 439.80
  4. Step 4: Simplify right side
    632.40x = 416,798.46
  5. Step 5: Solve for x
    x = 416,798.46/632.40
  6. Step 6: Final answer
    x = 659.07

Related Problems

Find fourth proportional to 316.20, 473.85 and 219.90
Half scale
Find fourth proportional to 1,264.80, 1,895.40 and 879.60
Double scale
Find fourth proportional to 633.40, 949.20 and 440.80
Similar ratio
Find fourth proportional to 948.60, 1,421.55 and 659.70
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.