Home / 309,708-679,128

Finding the Third Proportional to 309,708 and 679,128

Calculator

Solution

The third proportional to 309,708 and 679,128 is: 1,489,192.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,708 : 679,128 = 679,128 : x
  2. Step 2: Convert to fraction form
    309,708/679,128 = 679,128/x
  3. Step 3: Cross multiply
    309,708x = 679,128 × 679,128
  4. Step 4: Simplify right side
    309,708x = 461,214,840,384
  5. Step 5: Solve for x
    x = 461,214,840,384/309,708
  6. Step 6: Final answer
    x = 1,489,192.53

Related Problems

Find third proportional to 154,854 and 339,564
Half scale
Find third proportional to 619,416 and 1,358,256
Double scale
Find third proportional to 309,710 and 679,132
Similar ratio
Find third proportional to 464,562 and 1,018,692
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.