Home / 433.65-647.78-390.24

Finding the Fourth Proportional to 433.65, 647.78 and 390.24

Calculator

Solution

The fourth proportional to 433.65, 647.78 and 390.24 is: 582.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    433.65 : 647.78 = 390.24 : x
  2. Step 2: Convert to fraction form
    433.65/647.78 = 390.24/x
  3. Step 3: Cross multiply
    433.65x = 647.78 × 390.24
  4. Step 4: Simplify right side
    433.65x = 252,790.64
  5. Step 5: Solve for x
    x = 252,790.64/433.65
  6. Step 6: Final answer
    x = 582.94

Related Problems

Find fourth proportional to 216.83, 323.89 and 195.12
Half scale
Find fourth proportional to 867.30, 1,295.57 and 780.48
Double scale
Find fourth proportional to 434.65, 649.28 and 391.24
Similar ratio
Find fourth proportional to 650.48, 971.67 and 585.36
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.