Home / 128,808-279,684

Finding the Third Proportional to 128,808 and 279,684

Calculator

Solution

The third proportional to 128,808 and 279,684 is: 607,284.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,808 : 279,684 = 279,684 : x
  2. Step 2: Convert to fraction form
    128,808/279,684 = 279,684/x
  3. Step 3: Cross multiply
    128,808x = 279,684 × 279,684
  4. Step 4: Simplify right side
    128,808x = 78,223,139,856
  5. Step 5: Solve for x
    x = 78,223,139,856/128,808
  6. Step 6: Final answer
    x = 607,284.79

Related Problems

Find third proportional to 64,404 and 139,842
Half scale
Find third proportional to 257,616 and 559,368
Double scale
Find third proportional to 128,810 and 279,688
Similar ratio
Find third proportional to 193,212 and 419,526
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.