Home / 257,816-398,391

Finding the Third Proportional to 257,816 and 398,391

Calculator

Solution

The third proportional to 257,816 and 398,391 is: 615,614.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,816 : 398,391 = 398,391 : x
  2. Step 2: Convert to fraction form
    257,816/398,391 = 398,391/x
  3. Step 3: Cross multiply
    257,816x = 398,391 × 398,391
  4. Step 4: Simplify right side
    257,816x = 158,715,388,881
  5. Step 5: Solve for x
    x = 158,715,388,881/257,816
  6. Step 6: Final answer
    x = 615,614.97

Related Problems

Find third proportional to 128,908 and 199,195.50
Half scale
Find third proportional to 515,632 and 796,782
Double scale
Find third proportional to 257,818 and 398,394
Similar ratio
Find third proportional to 386,724 and 597,586.50
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.