Home / 659.70-989.28-226.80

Finding the Fourth Proportional to 659.70, 989.28 and 226.80

Calculator

Solution

The fourth proportional to 659.70, 989.28 and 226.80 is: 340.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.70 : 989.28 = 226.80 : x
  2. Step 2: Convert to fraction form
    659.70/989.28 = 226.80/x
  3. Step 3: Cross multiply
    659.70x = 989.28 × 226.80
  4. Step 4: Simplify right side
    659.70x = 224,368.70
  5. Step 5: Solve for x
    x = 224,368.70/659.70
  6. Step 6: Final answer
    x = 340.11

Related Problems

Find fourth proportional to 329.85, 494.64 and 113.40
Half scale
Find fourth proportional to 1,319.40, 1,978.56 and 453.60
Double scale
Find fourth proportional to 660.70, 990.78 and 227.80
Similar ratio
Find fourth proportional to 989.55, 1,483.92 and 340.20
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.