Home / 1,285.27-1,929-505.82

Finding the Fourth Proportional to 1,285.27, 1,929 and 505.82

Calculator

Solution

The fourth proportional to 1,285.27, 1,929 and 505.82 is: 759.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.27 : 1,929 = 505.82 : x
  2. Step 2: Convert to fraction form
    1,285.27/1,929 = 505.82/x
  3. Step 3: Cross multiply
    1,285.27x = 1,929 × 505.82
  4. Step 4: Simplify right side
    1,285.27x = 975,726.78
  5. Step 5: Solve for x
    x = 975,726.78/1,285.27
  6. Step 6: Final answer
    x = 759.16

Related Problems

Find fourth proportional to 642.64, 964.50 and 252.91
Half scale
Find fourth proportional to 2,570.54, 3,858 and 1,011.64
Double scale
Find fourth proportional to 1,286.27, 1,930.50 and 506.82
Similar ratio
Find fourth proportional to 1,927.91, 2,893.50 and 758.73
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.