Home / 430-691.50

Finding the Third Proportional to 430 and 691.50

Calculator

Solution

The third proportional to 430 and 691.50 is: 1,112.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    430 : 691.50 = 691.50 : x
  2. Step 2: Convert to fraction form
    430/691.50 = 691.50/x
  3. Step 3: Cross multiply
    430x = 691.50 × 691.50
  4. Step 4: Simplify right side
    430x = 478,172.25
  5. Step 5: Solve for x
    x = 478,172.25/430
  6. Step 6: Final answer
    x = 1,112.03

Related Problems

Find third proportional to 215 and 345.75
Half scale
Find third proportional to 860 and 1,383
Double scale
Find third proportional to 432 and 695
Similar ratio
Find third proportional to 645 and 1,037.25
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.