Home / 582.80-872.85-399.20

Finding the Fourth Proportional to 582.80, 872.85 and 399.20

Calculator

Solution

The fourth proportional to 582.80, 872.85 and 399.20 is: 597.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    582.80 : 872.85 = 399.20 : x
  2. Step 2: Convert to fraction form
    582.80/872.85 = 399.20/x
  3. Step 3: Cross multiply
    582.80x = 872.85 × 399.20
  4. Step 4: Simplify right side
    582.80x = 348,441.72
  5. Step 5: Solve for x
    x = 348,441.72/582.80
  6. Step 6: Final answer
    x = 597.88

Related Problems

Find fourth proportional to 291.40, 436.43 and 199.60
Half scale
Find fourth proportional to 1,165.60, 1,745.70 and 798.40
Double scale
Find fourth proportional to 583.80, 874.35 and 400.20
Similar ratio
Find fourth proportional to 874.20, 1,309.28 and 598.80
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.