Home / 859-1,185.48-505

Finding the Fourth Proportional to 859, 1,185.48 and 505

Calculator

Solution

The fourth proportional to 859, 1,185.48 and 505 is: 696.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    859 : 1,185.48 = 505 : x
  2. Step 2: Convert to fraction form
    859/1,185.48 = 505/x
  3. Step 3: Cross multiply
    859x = 1,185.48 × 505
  4. Step 4: Simplify right side
    859x = 598,667.40
  5. Step 5: Solve for x
    x = 598,667.40/859
  6. Step 6: Final answer
    x = 696.94

Related Problems

Find fourth proportional to 429.50, 592.74 and 252.50
Half scale
Find fourth proportional to 1,718, 2,370.96 and 1,010
Double scale
Find fourth proportional to 860, 1,186.86 and 506
Similar ratio
Find fourth proportional to 1,288.50, 1,778.22 and 757.50
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.