Home / 356.05-491.35-200.80

Finding the Fourth Proportional to 356.05, 491.35 and 200.80

Calculator

Solution

The fourth proportional to 356.05, 491.35 and 200.80 is: 277.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.05 : 491.35 = 200.80 : x
  2. Step 2: Convert to fraction form
    356.05/491.35 = 200.80/x
  3. Step 3: Cross multiply
    356.05x = 491.35 × 200.80
  4. Step 4: Simplify right side
    356.05x = 98,663.08
  5. Step 5: Solve for x
    x = 98,663.08/356.05
  6. Step 6: Final answer
    x = 277.10

Related Problems

Find fourth proportional to 178.03, 245.68 and 100.40
Half scale
Find fourth proportional to 712.10, 982.70 and 401.60
Double scale
Find fourth proportional to 357.05, 492.73 and 201.80
Similar ratio
Find fourth proportional to 534.08, 737.03 and 301.20
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.