Home / 257-385.66-105

Finding the Fourth Proportional to 257, 385.66 and 105

Calculator

Solution

The fourth proportional to 257, 385.66 and 105 is: 157.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    257 : 385.66 = 105 : x
  2. Step 2: Convert to fraction form
    257/385.66 = 105/x
  3. Step 3: Cross multiply
    257x = 385.66 × 105
  4. Step 4: Simplify right side
    257x = 40,494.30
  5. Step 5: Solve for x
    x = 40,494.30/257
  6. Step 6: Final answer
    x = 157.57

Related Problems

Find fourth proportional to 128.50, 192.83 and 52.50
Half scale
Find fourth proportional to 514, 771.32 and 210
Double scale
Find fourth proportional to 258, 387.16 and 106
Similar ratio
Find fourth proportional to 385.50, 578.49 and 157.50
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.