Home / 846.40-1,269.42-291.05

Finding the Fourth Proportional to 846.40, 1,269.42 and 291.05

Calculator

Solution

The fourth proportional to 846.40, 1,269.42 and 291.05 is: 436.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    846.40 : 1,269.42 = 291.05 : x
  2. Step 2: Convert to fraction form
    846.40/1,269.42 = 291.05/x
  3. Step 3: Cross multiply
    846.40x = 1,269.42 × 291.05
  4. Step 4: Simplify right side
    846.40x = 369,464.69
  5. Step 5: Solve for x
    x = 369,464.69/846.40
  6. Step 6: Final answer
    x = 436.51

Related Problems

Find fourth proportional to 423.20, 634.71 and 145.53
Half scale
Find fourth proportional to 1,692.80, 2,538.84 and 582.10
Double scale
Find fourth proportional to 847.40, 1,270.92 and 292.05
Similar ratio
Find fourth proportional to 1,269.60, 1,904.13 and 436.58
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.