Home / 390,018-840,708

Finding the Third Proportional to 390,018 and 840,708

Calculator

Solution

The third proportional to 390,018 and 840,708 is: 1,812,198.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,018 : 840,708 = 840,708 : x
  2. Step 2: Convert to fraction form
    390,018/840,708 = 840,708/x
  3. Step 3: Cross multiply
    390,018x = 840,708 × 840,708
  4. Step 4: Simplify right side
    390,018x = 706,789,941,264
  5. Step 5: Solve for x
    x = 706,789,941,264/390,018
  6. Step 6: Final answer
    x = 1,812,198.26

Related Problems

Find third proportional to 195,009 and 420,354
Half scale
Find third proportional to 780,036 and 1,681,416
Double scale
Find third proportional to 390,020 and 840,712
Similar ratio
Find third proportional to 585,027 and 1,261,062
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.