Home / 173.76-260.75-85.90

Finding the Fourth Proportional to 173.76, 260.75 and 85.90

Calculator

Solution

The fourth proportional to 173.76, 260.75 and 85.90 is: 128.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    173.76 : 260.75 = 85.90 : x
  2. Step 2: Convert to fraction form
    173.76/260.75 = 85.90/x
  3. Step 3: Cross multiply
    173.76x = 260.75 × 85.90
  4. Step 4: Simplify right side
    173.76x = 22,398.43
  5. Step 5: Solve for x
    x = 22,398.43/173.76
  6. Step 6: Final answer
    x = 128.90

Related Problems

Find fourth proportional to 86.88, 130.38 and 42.95
Half scale
Find fourth proportional to 347.52, 521.50 and 171.80
Double scale
Find fourth proportional to 174.76, 262.25 and 86.90
Similar ratio
Find fourth proportional to 260.64, 391.13 and 128.85
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.