Home / 1,039.87-1,560-309.38

Finding the Fourth Proportional to 1,039.87, 1,560 and 309.38

Calculator

Solution

The fourth proportional to 1,039.87, 1,560 and 309.38 is: 464.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.87 : 1,560 = 309.38 : x
  2. Step 2: Convert to fraction form
    1,039.87/1,560 = 309.38/x
  3. Step 3: Cross multiply
    1,039.87x = 1,560 × 309.38
  4. Step 4: Simplify right side
    1,039.87x = 482,632.80
  5. Step 5: Solve for x
    x = 482,632.80/1,039.87
  6. Step 6: Final answer
    x = 464.13

Related Problems

Find fourth proportional to 519.93, 780 and 154.69
Half scale
Find fourth proportional to 2,079.73, 3,120 and 618.76
Double scale
Find fourth proportional to 1,040.87, 1,561.50 and 310.38
Similar ratio
Find fourth proportional to 1,559.80, 2,340 and 464.07
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.