Home / 778.60-1,074-612.56

Finding the Fourth Proportional to 778.60, 1,074 and 612.56

Calculator

Solution

The fourth proportional to 778.60, 1,074 and 612.56 is: 844.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.60 : 1,074 = 612.56 : x
  2. Step 2: Convert to fraction form
    778.60/1,074 = 612.56/x
  3. Step 3: Cross multiply
    778.60x = 1,074 × 612.56
  4. Step 4: Simplify right side
    778.60x = 657,889.44
  5. Step 5: Solve for x
    x = 657,889.44/778.60
  6. Step 6: Final answer
    x = 844.96

Related Problems

Find fourth proportional to 389.30, 537 and 306.28
Half scale
Find fourth proportional to 1,557.20, 2,148 and 1,225.12
Double scale
Find fourth proportional to 779.60, 1,075.38 and 613.56
Similar ratio
Find fourth proportional to 1,167.90, 1,611 and 918.84
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.