Home / 436.40-653.84-418.40

Finding the Fourth Proportional to 436.40, 653.84 and 418.40

Calculator

Solution

The fourth proportional to 436.40, 653.84 and 418.40 is: 626.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.40 : 653.84 = 418.40 : x
  2. Step 2: Convert to fraction form
    436.40/653.84 = 418.40/x
  3. Step 3: Cross multiply
    436.40x = 653.84 × 418.40
  4. Step 4: Simplify right side
    436.40x = 273,566.66
  5. Step 5: Solve for x
    x = 273,566.66/436.40
  6. Step 6: Final answer
    x = 626.87

Related Problems

Find fourth proportional to 218.20, 326.92 and 209.20
Half scale
Find fourth proportional to 872.80, 1,307.68 and 836.80
Double scale
Find fourth proportional to 437.40, 655.34 and 419.40
Similar ratio
Find fourth proportional to 654.60, 980.76 and 627.60
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.