Home / 574.80-861.20-518.40

Finding the Fourth Proportional to 574.80, 861.20 and 518.40

Calculator

Solution

The fourth proportional to 574.80, 861.20 and 518.40 is: 776.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.80 : 861.20 = 518.40 : x
  2. Step 2: Convert to fraction form
    574.80/861.20 = 518.40/x
  3. Step 3: Cross multiply
    574.80x = 861.20 × 518.40
  4. Step 4: Simplify right side
    574.80x = 446,446.08
  5. Step 5: Solve for x
    x = 446,446.08/574.80
  6. Step 6: Final answer
    x = 776.70

Related Problems

Find fourth proportional to 287.40, 430.60 and 259.20
Half scale
Find fourth proportional to 1,149.60, 1,722.40 and 1,036.80
Double scale
Find fourth proportional to 575.80, 862.70 and 519.40
Similar ratio
Find fourth proportional to 862.20, 1,291.80 and 777.60
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.