Home / 193.43-290.12-85.20

Finding the Fourth Proportional to 193.43, 290.12 and 85.20

Calculator

Solution

The fourth proportional to 193.43, 290.12 and 85.20 is: 127.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    193.43 : 290.12 = 85.20 : x
  2. Step 2: Convert to fraction form
    193.43/290.12 = 85.20/x
  3. Step 3: Cross multiply
    193.43x = 290.12 × 85.20
  4. Step 4: Simplify right side
    193.43x = 24,717.80
  5. Step 5: Solve for x
    x = 24,717.80/193.43
  6. Step 6: Final answer
    x = 127.79

Related Problems

Find fourth proportional to 96.71, 145.06 and 42.60
Half scale
Find fourth proportional to 386.85, 580.23 and 170.40
Double scale
Find fourth proportional to 194.43, 291.61 and 86.20
Similar ratio
Find fourth proportional to 290.14, 435.17 and 127.80
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.