Home / 1,395.19-2,092.48-408

Finding the Fourth Proportional to 1,395.19, 2,092.48 and 408

Calculator

Solution

The fourth proportional to 1,395.19, 2,092.48 and 408 is: 611.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.19 : 2,092.48 = 408 : x
  2. Step 2: Convert to fraction form
    1,395.19/2,092.48 = 408/x
  3. Step 3: Cross multiply
    1,395.19x = 2,092.48 × 408
  4. Step 4: Simplify right side
    1,395.19x = 853,731.84
  5. Step 5: Solve for x
    x = 853,731.84/1,395.19
  6. Step 6: Final answer
    x = 611.91

Related Problems

Find fourth proportional to 697.60, 1,046.24 and 204
Half scale
Find fourth proportional to 2,790.38, 4,184.96 and 816
Double scale
Find fourth proportional to 1,396.19, 2,093.98 and 409
Similar ratio
Find fourth proportional to 2,092.79, 3,138.72 and 612
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.