Home / 289.80-398.25-261

Finding the Fourth Proportional to 289.80, 398.25 and 261

Calculator

Solution

The fourth proportional to 289.80, 398.25 and 261 is: 358.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.80 : 398.25 = 261 : x
  2. Step 2: Convert to fraction form
    289.80/398.25 = 261/x
  3. Step 3: Cross multiply
    289.80x = 398.25 × 261
  4. Step 4: Simplify right side
    289.80x = 103,943.25
  5. Step 5: Solve for x
    x = 103,943.25/289.80
  6. Step 6: Final answer
    x = 358.67

Related Problems

Find fourth proportional to 144.90, 199.13 and 130.50
Half scale
Find fourth proportional to 579.60, 796.50 and 522
Double scale
Find fourth proportional to 290.80, 399.62 and 262
Similar ratio
Find fourth proportional to 434.70, 597.38 and 391.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.