Home / 778.20-1,167.50-431.47

Finding the Fourth Proportional to 778.20, 1,167.50 and 431.47

Calculator

Solution

The fourth proportional to 778.20, 1,167.50 and 431.47 is: 647.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.20 : 1,167.50 = 431.47 : x
  2. Step 2: Convert to fraction form
    778.20/1,167.50 = 431.47/x
  3. Step 3: Cross multiply
    778.20x = 1,167.50 × 431.47
  4. Step 4: Simplify right side
    778.20x = 503,741.23
  5. Step 5: Solve for x
    x = 503,741.23/778.20
  6. Step 6: Final answer
    x = 647.32

Related Problems

Find fourth proportional to 389.10, 583.75 and 215.74
Half scale
Find fourth proportional to 1,556.40, 2,335 and 862.94
Double scale
Find fourth proportional to 779.20, 1,169 and 432.47
Similar ratio
Find fourth proportional to 1,167.30, 1,751.25 and 647.21
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.