Home / 1,080-1,620.27-310.50

Finding the Fourth Proportional to 1,080, 1,620.27 and 310.50

Calculator

Solution

The fourth proportional to 1,080, 1,620.27 and 310.50 is: 465.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080 : 1,620.27 = 310.50 : x
  2. Step 2: Convert to fraction form
    1,080/1,620.27 = 310.50/x
  3. Step 3: Cross multiply
    1,080x = 1,620.27 × 310.50
  4. Step 4: Simplify right side
    1,080x = 503,093.84
  5. Step 5: Solve for x
    x = 503,093.84/1,080
  6. Step 6: Final answer
    x = 465.83

Related Problems

Find fourth proportional to 540, 810.14 and 155.25
Half scale
Find fourth proportional to 2,160, 3,240.54 and 621
Double scale
Find fourth proportional to 1,081, 1,621.77 and 311.50
Similar ratio
Find fourth proportional to 1,620, 2,430.41 and 465.75
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.