Home / 571.39-788.51-309.40

Finding the Fourth Proportional to 571.39, 788.51 and 309.40

Calculator

Solution

The fourth proportional to 571.39, 788.51 and 309.40 is: 426.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    571.39 : 788.51 = 309.40 : x
  2. Step 2: Convert to fraction form
    571.39/788.51 = 309.40/x
  3. Step 3: Cross multiply
    571.39x = 788.51 × 309.40
  4. Step 4: Simplify right side
    571.39x = 243,964.99
  5. Step 5: Solve for x
    x = 243,964.99/571.39
  6. Step 6: Final answer
    x = 426.97

Related Problems

Find fourth proportional to 285.70, 394.26 and 154.70
Half scale
Find fourth proportional to 1,142.78, 1,577.02 and 618.80
Double scale
Find fourth proportional to 572.39, 789.89 and 310.40
Similar ratio
Find fourth proportional to 857.09, 1,182.77 and 464.10
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.