Home / 515.18-772.50-206.78

Finding the Fourth Proportional to 515.18, 772.50 and 206.78

Calculator

Solution

The fourth proportional to 515.18, 772.50 and 206.78 is: 310.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.18 : 772.50 = 206.78 : x
  2. Step 2: Convert to fraction form
    515.18/772.50 = 206.78/x
  3. Step 3: Cross multiply
    515.18x = 772.50 × 206.78
  4. Step 4: Simplify right side
    515.18x = 159,737.55
  5. Step 5: Solve for x
    x = 159,737.55/515.18
  6. Step 6: Final answer
    x = 310.06

Related Problems

Find fourth proportional to 257.59, 386.25 and 103.39
Half scale
Find fourth proportional to 1,030.36, 1,545 and 413.56
Double scale
Find fourth proportional to 516.18, 774 and 207.78
Similar ratio
Find fourth proportional to 772.77, 1,158.75 and 310.17
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.