Home / 460.20-690.29-378.80

Finding the Fourth Proportional to 460.20, 690.29 and 378.80

Calculator

Solution

The fourth proportional to 460.20, 690.29 and 378.80 is: 568.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    460.20 : 690.29 = 378.80 : x
  2. Step 2: Convert to fraction form
    460.20/690.29 = 378.80/x
  3. Step 3: Cross multiply
    460.20x = 690.29 × 378.80
  4. Step 4: Simplify right side
    460.20x = 261,476.51
  5. Step 5: Solve for x
    x = 261,476.51/460.20
  6. Step 6: Final answer
    x = 568.18

Related Problems

Find fourth proportional to 230.10, 345.14 and 189.40
Half scale
Find fourth proportional to 920.40, 1,380.57 and 757.59
Double scale
Find fourth proportional to 461.20, 691.78 and 379.80
Similar ratio
Find fourth proportional to 690.30, 1,035.43 and 568.19
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.