Home / 316.98-475.49-85.86

Finding the Fourth Proportional to 316.98, 475.49 and 85.86

Calculator

Solution

The fourth proportional to 316.98, 475.49 and 85.86 is: 128.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.98 : 475.49 = 85.86 : x
  2. Step 2: Convert to fraction form
    316.98/475.49 = 85.86/x
  3. Step 3: Cross multiply
    316.98x = 475.49 × 85.86
  4. Step 4: Simplify right side
    316.98x = 40,825.79
  5. Step 5: Solve for x
    x = 40,825.79/316.98
  6. Step 6: Final answer
    x = 128.80

Related Problems

Find fourth proportional to 158.49, 237.75 and 42.93
Half scale
Find fourth proportional to 633.96, 950.99 and 171.72
Double scale
Find fourth proportional to 317.98, 476.99 and 86.86
Similar ratio
Find fourth proportional to 475.47, 713.24 and 128.79
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.