Home / 215,550-289,971

Finding the Third Proportional to 215,550 and 289,971

Calculator

Solution

The third proportional to 215,550 and 289,971 is: 390,086.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,550 : 289,971 = 289,971 : x
  2. Step 2: Convert to fraction form
    215,550/289,971 = 289,971/x
  3. Step 3: Cross multiply
    215,550x = 289,971 × 289,971
  4. Step 4: Simplify right side
    215,550x = 84,083,180,841
  5. Step 5: Solve for x
    x = 84,083,180,841/215,550
  6. Step 6: Final answer
    x = 390,086.67

Related Problems

Find third proportional to 107,775 and 144,985.50
Half scale
Find third proportional to 431,100 and 579,942
Double scale
Find third proportional to 215,552 and 289,974
Similar ratio
Find third proportional to 323,325 and 434,956.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.