Home / 605.40-908.10-419.10

Finding the Fourth Proportional to 605.40, 908.10 and 419.10

Calculator

Solution

The fourth proportional to 605.40, 908.10 and 419.10 is: 628.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    605.40 : 908.10 = 419.10 : x
  2. Step 2: Convert to fraction form
    605.40/908.10 = 419.10/x
  3. Step 3: Cross multiply
    605.40x = 908.10 × 419.10
  4. Step 4: Simplify right side
    605.40x = 380,584.71
  5. Step 5: Solve for x
    x = 380,584.71/605.40
  6. Step 6: Final answer
    x = 628.65

Related Problems

Find fourth proportional to 302.70, 454.05 and 209.55
Half scale
Find fourth proportional to 1,210.80, 1,816.20 and 838.20
Double scale
Find fourth proportional to 606.40, 909.60 and 420.10
Similar ratio
Find fourth proportional to 908.10, 1,362.15 and 628.65
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.