Home / 257,728-387,070

Finding the Third Proportional to 257,728 and 387,070

Calculator

Solution

The third proportional to 257,728 and 387,070 is: 581,322.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,728 : 387,070 = 387,070 : x
  2. Step 2: Convert to fraction form
    257,728/387,070 = 387,070/x
  3. Step 3: Cross multiply
    257,728x = 387,070 × 387,070
  4. Step 4: Simplify right side
    257,728x = 149,823,184,900
  5. Step 5: Solve for x
    x = 149,823,184,900/257,728
  6. Step 6: Final answer
    x = 581,322.89

Related Problems

Find third proportional to 128,864 and 193,535
Half scale
Find third proportional to 515,456 and 774,140
Double scale
Find third proportional to 257,730 and 387,073
Similar ratio
Find third proportional to 386,592 and 580,605
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.