Home / 231-315

Finding the Third Proportional to 231 and 315

Calculator

Solution

The third proportional to 231 and 315 is: 429.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    231 : 315 = 315 : x
  2. Step 2: Convert to fraction form
    231/315 = 315/x
  3. Step 3: Cross multiply
    231x = 315 × 315
  4. Step 4: Simplify right side
    231x = 99,225
  5. Step 5: Solve for x
    x = 99,225/231
  6. Step 6: Final answer
    x = 429.55

Related Problems

Find third proportional to 115.50 and 157.50
Half scale
Find third proportional to 462 and 630
Double scale
Find third proportional to 233 and 318
Similar ratio
Find third proportional to 346.50 and 472.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.