Home / 196.80-271.56-123.12

Finding the Fourth Proportional to 196.80, 271.56 and 123.12

Calculator

Solution

The fourth proportional to 196.80, 271.56 and 123.12 is: 169.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    196.80 : 271.56 = 123.12 : x
  2. Step 2: Convert to fraction form
    196.80/271.56 = 123.12/x
  3. Step 3: Cross multiply
    196.80x = 271.56 × 123.12
  4. Step 4: Simplify right side
    196.80x = 33,434.47
  5. Step 5: Solve for x
    x = 33,434.47/196.80
  6. Step 6: Final answer
    x = 169.89

Related Problems

Find fourth proportional to 98.40, 135.78 and 61.56
Half scale
Find fourth proportional to 393.60, 543.12 and 246.24
Double scale
Find fourth proportional to 197.80, 272.94 and 124.12
Similar ratio
Find fourth proportional to 295.20, 407.34 and 184.68
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.