Home / 441.64-661.98-390.42

Finding the Fourth Proportional to 441.64, 661.98 and 390.42

Calculator

Solution

The fourth proportional to 441.64, 661.98 and 390.42 is: 585.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    441.64 : 661.98 = 390.42 : x
  2. Step 2: Convert to fraction form
    441.64/661.98 = 390.42/x
  3. Step 3: Cross multiply
    441.64x = 661.98 × 390.42
  4. Step 4: Simplify right side
    441.64x = 258,450.23
  5. Step 5: Solve for x
    x = 258,450.23/441.64
  6. Step 6: Final answer
    x = 585.21

Related Problems

Find fourth proportional to 220.82, 330.99 and 195.21
Half scale
Find fourth proportional to 883.28, 1,323.96 and 780.84
Double scale
Find fourth proportional to 442.64, 663.48 and 391.42
Similar ratio
Find fourth proportional to 662.46, 992.97 and 585.63
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.