Home / 835.80-1,250.82-643.80

Finding the Fourth Proportional to 835.80, 1,250.82 and 643.80

Calculator

Solution

The fourth proportional to 835.80, 1,250.82 and 643.80 is: 963.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    835.80 : 1,250.82 = 643.80 : x
  2. Step 2: Convert to fraction form
    835.80/1,250.82 = 643.80/x
  3. Step 3: Cross multiply
    835.80x = 1,250.82 × 643.80
  4. Step 4: Simplify right side
    835.80x = 805,277.92
  5. Step 5: Solve for x
    x = 805,277.92/835.80
  6. Step 6: Final answer
    x = 963.48

Related Problems

Find fourth proportional to 417.90, 625.41 and 321.90
Half scale
Find fourth proportional to 1,671.60, 2,501.64 and 1,287.60
Double scale
Find fourth proportional to 836.80, 1,252.32 and 644.80
Similar ratio
Find fourth proportional to 1,253.70, 1,876.23 and 965.70
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.