Home / 138,816-308,688

Finding the Third Proportional to 138,816 and 308,688

Calculator

Solution

The third proportional to 138,816 and 308,688 is: 686,435.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,816 : 308,688 = 308,688 : x
  2. Step 2: Convert to fraction form
    138,816/308,688 = 308,688/x
  3. Step 3: Cross multiply
    138,816x = 308,688 × 308,688
  4. Step 4: Simplify right side
    138,816x = 95,288,281,344
  5. Step 5: Solve for x
    x = 95,288,281,344/138,816
  6. Step 6: Final answer
    x = 686,435.87

Related Problems

Find third proportional to 69,408 and 154,344
Half scale
Find third proportional to 277,632 and 617,376
Double scale
Find third proportional to 138,818 and 308,692
Similar ratio
Find third proportional to 208,224 and 463,032
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.