Home / 96.80-133.57-61.86

Finding the Fourth Proportional to 96.80, 133.57 and 61.86

Calculator

Solution

The fourth proportional to 96.80, 133.57 and 61.86 is: 85.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.80 : 133.57 = 61.86 : x
  2. Step 2: Convert to fraction form
    96.80/133.57 = 61.86/x
  3. Step 3: Cross multiply
    96.80x = 133.57 × 61.86
  4. Step 4: Simplify right side
    96.80x = 8,262.76
  5. Step 5: Solve for x
    x = 8,262.76/96.80
  6. Step 6: Final answer
    x = 85.36

Related Problems

Find fourth proportional to 48.40, 66.78 and 30.93
Half scale
Find fourth proportional to 193.60, 267.14 and 123.72
Double scale
Find fourth proportional to 97.80, 134.95 and 62.86
Similar ratio
Find fourth proportional to 145.20, 200.35 and 92.79
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.