Home / 306-431

Finding the Third Proportional to 306 and 431

Calculator

Solution

The third proportional to 306 and 431 is: 607.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    306 : 431 = 431 : x
  2. Step 2: Convert to fraction form
    306/431 = 431/x
  3. Step 3: Cross multiply
    306x = 431 × 431
  4. Step 4: Simplify right side
    306x = 185,761
  5. Step 5: Solve for x
    x = 185,761/306
  6. Step 6: Final answer
    x = 607.06

Related Problems

Find third proportional to 153 and 215.50
Half scale
Find third proportional to 612 and 862
Double scale
Find third proportional to 308 and 434
Similar ratio
Find third proportional to 459 and 646.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.