Home / 817-1,225.50-239.90

Finding the Fourth Proportional to 817, 1,225.50 and 239.90

Calculator

Solution

The fourth proportional to 817, 1,225.50 and 239.90 is: 359.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    817 : 1,225.50 = 239.90 : x
  2. Step 2: Convert to fraction form
    817/1,225.50 = 239.90/x
  3. Step 3: Cross multiply
    817x = 1,225.50 × 239.90
  4. Step 4: Simplify right side
    817x = 293,997.45
  5. Step 5: Solve for x
    x = 293,997.45/817
  6. Step 6: Final answer
    x = 359.85

Related Problems

Find fourth proportional to 408.50, 612.75 and 119.95
Half scale
Find fourth proportional to 1,634, 2,451 and 479.80
Double scale
Find fourth proportional to 818, 1,227 and 240.90
Similar ratio
Find fourth proportional to 1,225.50, 1,838.25 and 359.85
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.