Home / 148.30-204.65-81.90

Finding the Fourth Proportional to 148.30, 204.65 and 81.90

Calculator

Solution

The fourth proportional to 148.30, 204.65 and 81.90 is: 113.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.30 : 204.65 = 81.90 : x
  2. Step 2: Convert to fraction form
    148.30/204.65 = 81.90/x
  3. Step 3: Cross multiply
    148.30x = 204.65 × 81.90
  4. Step 4: Simplify right side
    148.30x = 16,760.33
  5. Step 5: Solve for x
    x = 16,760.33/148.30
  6. Step 6: Final answer
    x = 113.02

Related Problems

Find fourth proportional to 74.15, 102.32 and 40.95
Half scale
Find fourth proportional to 296.60, 409.29 and 163.80
Double scale
Find fourth proportional to 149.30, 206.03 and 82.90
Similar ratio
Find fourth proportional to 222.45, 306.97 and 122.85
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.