Home / 390,772-856,428

Finding the Third Proportional to 390,772 and 856,428

Calculator

Solution

The third proportional to 390,772 and 856,428 is: 1,876,974.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,772 : 856,428 = 856,428 : x
  2. Step 2: Convert to fraction form
    390,772/856,428 = 856,428/x
  3. Step 3: Cross multiply
    390,772x = 856,428 × 856,428
  4. Step 4: Simplify right side
    390,772x = 733,468,919,184
  5. Step 5: Solve for x
    x = 733,468,919,184/390,772
  6. Step 6: Final answer
    x = 1,876,974.09

Related Problems

Find third proportional to 195,386 and 428,214
Half scale
Find third proportional to 781,544 and 1,712,856
Double scale
Find third proportional to 390,774 and 856,432
Similar ratio
Find third proportional to 586,158 and 1,284,642
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.