Home / 258,000-398,670

Finding the Third Proportional to 258,000 and 398,670

Calculator

Solution

The third proportional to 258,000 and 398,670 is: 616,037.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,000 : 398,670 = 398,670 : x
  2. Step 2: Convert to fraction form
    258,000/398,670 = 398,670/x
  3. Step 3: Cross multiply
    258,000x = 398,670 × 398,670
  4. Step 4: Simplify right side
    258,000x = 158,937,768,900
  5. Step 5: Solve for x
    x = 158,937,768,900/258,000
  6. Step 6: Final answer
    x = 616,037.86

Related Problems

Find third proportional to 129,000 and 199,335
Half scale
Find third proportional to 516,000 and 797,340
Double scale
Find third proportional to 258,002 and 398,673
Similar ratio
Find third proportional to 387,000 and 598,005
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.