Home / 696.50-961.17-381.78

Finding the Fourth Proportional to 696.50, 961.17 and 381.78

Calculator

Solution

The fourth proportional to 696.50, 961.17 and 381.78 is: 526.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.50 : 961.17 = 381.78 : x
  2. Step 2: Convert to fraction form
    696.50/961.17 = 381.78/x
  3. Step 3: Cross multiply
    696.50x = 961.17 × 381.78
  4. Step 4: Simplify right side
    696.50x = 366,954.05
  5. Step 5: Solve for x
    x = 366,954.05/696.50
  6. Step 6: Final answer
    x = 526.86

Related Problems

Find fourth proportional to 348.25, 480.58 and 190.89
Half scale
Find fourth proportional to 1,393.00, 1,922.33 and 763.56
Double scale
Find fourth proportional to 697.50, 962.55 and 382.78
Similar ratio
Find fourth proportional to 1,044.75, 1,441.75 and 572.67
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.