Home / 515-710.70-331

Finding the Fourth Proportional to 515, 710.70 and 331

Calculator

Solution

The fourth proportional to 515, 710.70 and 331 is: 456.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    515 : 710.70 = 331 : x
  2. Step 2: Convert to fraction form
    515/710.70 = 331/x
  3. Step 3: Cross multiply
    515x = 710.70 × 331
  4. Step 4: Simplify right side
    515x = 235,241.70
  5. Step 5: Solve for x
    x = 235,241.70/515
  6. Step 6: Final answer
    x = 456.78

Related Problems

Find fourth proportional to 257.50, 355.35 and 165.50
Half scale
Find fourth proportional to 1,030, 1,421.40 and 662
Double scale
Find fourth proportional to 516, 712.08 and 332
Similar ratio
Find fourth proportional to 772.50, 1,066.05 and 496.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.