Home / 128,723-278,890

Finding the Third Proportional to 128,723 and 278,890

Calculator

Solution

The third proportional to 128,723 and 278,890 is: 604,240.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,723 : 278,890 = 278,890 : x
  2. Step 2: Convert to fraction form
    128,723/278,890 = 278,890/x
  3. Step 3: Cross multiply
    128,723x = 278,890 × 278,890
  4. Step 4: Simplify right side
    128,723x = 77,779,632,100
  5. Step 5: Solve for x
    x = 77,779,632,100/128,723
  6. Step 6: Final answer
    x = 604,240.36

Related Problems

Find third proportional to 64,361.50 and 139,445
Half scale
Find third proportional to 257,446 and 557,780
Double scale
Find third proportional to 128,725 and 278,894
Similar ratio
Find third proportional to 193,084.50 and 418,335
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.