Home / 128,890-290,689

Finding the Third Proportional to 128,890 and 290,689

Calculator

Solution

The third proportional to 128,890 and 290,689 is: 655,598.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,890 : 290,689 = 290,689 : x
  2. Step 2: Convert to fraction form
    128,890/290,689 = 290,689/x
  3. Step 3: Cross multiply
    128,890x = 290,689 × 290,689
  4. Step 4: Simplify right side
    128,890x = 84,500,094,721
  5. Step 5: Solve for x
    x = 84,500,094,721/128,890
  6. Step 6: Final answer
    x = 655,598.53

Related Problems

Find third proportional to 64,445 and 145,344.50
Half scale
Find third proportional to 257,780 and 581,378
Double scale
Find third proportional to 128,892 and 290,694
Similar ratio
Find third proportional to 193,335 and 436,033.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.26) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.