Home / 853.10-1,279.23-275.90

Finding the Fourth Proportional to 853.10, 1,279.23 and 275.90

Calculator

Solution

The fourth proportional to 853.10, 1,279.23 and 275.90 is: 413.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.10 : 1,279.23 = 275.90 : x
  2. Step 2: Convert to fraction form
    853.10/1,279.23 = 275.90/x
  3. Step 3: Cross multiply
    853.10x = 1,279.23 × 275.90
  4. Step 4: Simplify right side
    853.10x = 352,939.56
  5. Step 5: Solve for x
    x = 352,939.56/853.10
  6. Step 6: Final answer
    x = 413.71

Related Problems

Find fourth proportional to 426.55, 639.62 and 137.95
Half scale
Find fourth proportional to 1,706.20, 2,558.46 and 551.80
Double scale
Find fourth proportional to 854.10, 1,280.73 and 276.90
Similar ratio
Find fourth proportional to 1,279.65, 1,918.85 and 413.85
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.